What carb?

We need your intended use, plus things like header tube size, torque convertor stall, tire size, and if at all possible, some idea what "a big cam" is. In truth, I dont think you'll need anything over 750, and I'd lean towards a vaccum secondary, depending on the answers to my questions. Budget wise, you couldnt miss wiht a well tuned 3310 750 Holley, maybe a 770 Street Avenger, or 750 Street Demon if fundage allows. All will need some form of tuning, but they'll all do the job.