I have a newly rebuilt and bored out 455 that is going in my 69 GTO. I went with a slightly larger cam, new lifters, springs, ground down crank shaft, the works. I am replacing all the components that have anything to do with running through the engine. Fuel system, radiator, and Carb! I have narrowed down two carbs that I am debating on and am wondering if anyone has had any good or bad experiences with them. They are the Quick Fuel 750 Brawler or the Demon 750 Street Demon.