Re: 1977 Skylark S/R
I like the Q-jets a lot, and use them on all my cars..
the 800 CFM's aren't all that rare - if you need a divorced (manifold mounted) choke, then any 71-73 Buick 455 carb will work, the last 3 digits of the carb number will end in 540 or 240 for the easiest ones to find. A rebuildable core on e-bay will run you less than 100.00.
But the 800 CFM carb I like even better is any 2nd generation M4M 76-79 Buick Quadrajet, no matter what it was on. These generally go for pretty cheap as people consider them emissions carbs. They will have a hot air choke set up, but are easily converted to an electric choke. These will require some recalibraton from an expert like Ken from Everyday Performance (Techg8), or Mark (Carmanx?), but are a better design than previous carbs. I look for 76 240 carbs, or 77-79 247 or 249 carbs.
IMO, if you drive your car anywhere these are better choices than a Holley, and will support a car running well into the 11's in basically stock configuration with no trouble at all.
65 Gran Sport Convertible
71 GS455 - Unconfirmed Stage1
73 Gran Sport Stage1 4spd
72 Pontiac Grand Ville Convertible
71 GS455 Conv. 4spd Tribute - Sold, now a Swedish citizen
66 Corvair Monza 140 4spd Convertible - Sold, presumed Hurricane Sandy victim