There will be no off the shelf carb that will be perfect out of the box. I promise.
If you don't need a choke, I would use a Quick Fuel Q-750. I build them custom to fit each engine...you don't have to worry about "race calibrations" or "competition" curves. You get the carb with the correct IFR's, air bleeds, jets, etc. and about all you'll have to do is check the float levels and set the idle.
I dyno'd a 351C yesterday. The customer supplied a Holley 850 DP carb to go on it. We dyno'd it and it made 420hp @ 6200 with that carb. We stuck one of our Quick Fuel Q-650's on it and it made the same horsepower.
