750 from a Quadrjet is not to big. This is basically stock. Original carburetor is a Carter AFB 7023142. Read up on them there pretty good carbs. These are good carbs when rebuilt and tuned correctly. I know where there's one at all rebuilt and comes with a Intake. Gary
I had a 750 Edelbrock on mine. It loved it, ran great. Hooking up the switch pitch lever takes a little doing but is fairly straight forward.