Help choosing new carb

It's time to invest in a new carburetor so I need some help. I know a Q-jet would be best but I don't know all the specs on my engine, and it's set up for a holley right now. I've been running an old 3310 which ran decent but runs very rich, mixture screws won't make a difference, and idles erratically, leaks, it needs more than a rebuild more like an over haul so my minds made up on a new one.
What I do know is it's a 70 455 with iron stage 1 heads, hei, TA intake, hooker headers, auto, 4:10 gears, a cam somewhere in between mild and radical is the best I can determine.
I know there is really no out of the box carb, but something close where maybe just your idle and mixture screws need adjusting would be ideal. I was looking at this one, I like the manual choke idea also, or maybe you can lead me to something closer to what's best for this application. Thanks guys.

https://www.ebay.com/itm/Holley-Performance-0-3310SA-Street-Strip-Carburetor/163373555220

 

I think you probably have enough info for Mark or Ken to set up a QJet for you . Just check in with them and see .
That new Holley is basically what you have already . As long as it checks out ok a kit and vac sec diaphragm will cost you about $50 . At least that's what I pay . Correction , kit and adjustable vacuum sec assy . If you do use the Holley consider adding a rear metering block kit . And check the front block number , #10569 I think . Memory .
750 - 850 cfm is ballpark for you , depending on driving style .

 

Thanks Del, the intake I have is for a holley and would rather not use an adapter for a Q-jet. There is no choke plate on my carb, I guess one could be put on? Would you be interested in rebuilding mine?

 

https://www.holley.com/products/fue...actory_refurbished_carburetors/parts/FR-82951

My suggestion

 

Thank you Ethan, but would that be too much carb for my application?

 

That's a nice carb . And 950 cfm is plenty . You have to make that decision . Do your homework .
Just off the top of my head , if you send carb to me : labor $75 - $100 , kit $25 , adjustable vac sec $25 , rear metering block kit $60 , manual choke $35 , electric choke $65 . That will give you an idea . And there is a proform HP style body ( no choke ) $150 . Rebuilt one with that , went to Australia .

 

Just thinking , I have a 3310 now for sale on eBay and Craigslist . Oem spec plus adjustable vacuum sec . I could add stuff , trade yours in , whatever . Food for thought .
Also I've had a couple conversations on here about Edelbrock 800 cfm AVS carbs . They were pretty happy with them . I've got one redone , saving it for my own use/test later .
EFI ?
There's a lot of choices . It's tough .

 

Well it does gets a little confusing. I was thinking vacuum sec and the one hugger posted has mechanical and I see now it's not available on line, probably sold as it was available earlier. Can you post a link to your auction? I may be interested, rather then waiting for a rebuild.

 

The 950s only flow around 830cfm as they use the 750 base plate,..but with 410 gear and the single plane those are just more favorable when paired with a mechanical secondary carb

 

Actually I just found it. I also started looking into the Edelbrock 1812. I like your 3310 but will that be big enough not sure.

https://www.ebay.com/itm/Edelbrock-carburetor-800-CFM-Thunder-series-1812/303194307475

 

Ethan that sounds about right, maybe perfect but I though vacuum sec would be better for auto? Sorry just reread your reply.

 

Also just noticed that carb not available with your link, was earlier.

 

I think a oem spec 3310 or 750-800 range edelbrock on a cruiser , low rpm stockish 455 will work perfectly respectable . other choices also but those are the most common , budget friendly choices . a well rebuilt "spec to your combo" q-jet will be optimal and really not more expensive unless you are going for the BJ GS stage one numbers matching carbs . maybe switch manifolds ? TA q-jet style or newer B4B style maybe ? older versions are holley pattern .
when you get into more engine mod's , gears , tran's mods , aggressive driving style etc then its more of a crap shoot sorta . if its gonna be a weekend car show , cruiser , kick it in the fanny once in awhile carb then crisp n clean is going to maybe be best . but if you want the "race" , dominator look when the hoods up .......... $

 

Well after looking at your auction and looking at my carb they are different. I thought mine was a 3310 but it looks different. It has these numbers 12r-10552b on it? Here are a couple of pictures, I know it's dirty but it leaks until the gaskets swell up, has gotten my manifold dis colored. Despite the way it looks she runs good just idles erratically after it warms up.

 

oh yeah , those estimates I gave ya , right out the window . that carb is an old holley 4011/12 series . basically they sold it to summit or whatever , now sold as a summit brand carb . kits seem kinda pricey , no real parts interchange with the regular holley stuff . I see them for sale once in awhile ( cheap ! ) but stay away from them .
on the plus side you could probably sell those K-B valve covers and buy a nice new carb !

 

So just invest in a new manifold also? An adapter may take away some performance?

 

I have no proof but theory is that an adapter costs about 50 - 100 cfm . and i'd hazard a guess that it sure won't help airflow .

 

Del maybe I should just get the carb you have on ebay, it's got to be better than what I have? I can always keep my eyes open for a used q-jet intake and have a carb built for me while I can still enjoy the car.