[MARKDTN]

If it works well, I would rebuild the Qjet. A Qjet is a great carb for mileage and power. They get a bad reputation because if not rebuilt correctly, theyt can bog and do other bad things.

If you are dead-set against the Qjet, Holley used to have a carb just for this application-402BB spreadbore 750CFM vacuum secomdaries. I ran one on a 455 Pontiac years ago and it was a good match for it too.