I have a Carter AFB carb, 600 cfm, manual choke. I took this off because frankly it sucks off road. If however you want a carb for street driving, this thing rocks. It is the same as the edelbrock 1400 series. Has great throttle response that a q-jet just can't match. It was on a 402BB engine, but would probably be better suited on a small block. It worked great when I pulled it, but it's age is unknownn (on truck when I got it) guessing 6+ years old. Wouldn't be a bad idea to rebuild it, supposedly cheap and easy to rebuild these. Sells new for $199 on summitracing.com and rebuild kit is $25, though it does work as is. Would like $50 for it + shipping.