Well I called Holley/ QF little bit ago to see if I would get different advice on why the mixture screws are not operating correctly and ask the question of the picture. They said that it's normal for the screw tip to go into the IFR channel. Funny thing is I have read on a couple different sites about this metering block issue QF had. I just don't understand where the punch through would be other then where it's visible now. So after going over the normal stuff like t-slot exposure, PV leaking, fuel pressure and bowl height, they have no explanation on where the extra fuel might be coming from. It looks like I'll have to take Larry's advice and send it in and pay the $250.00 + shipping for them to overhaul it and do a flow test. Problem is I'd be almost 1/3 the way for a new carburetor at that point so I'm thinking that's not gonna be money well spent. I think it's to much of a race carb for my motor, maybe a standard type 850 would do better?