Carb Selection

Oh and I forgot to add, if it were me i'd run the 750cfm if most of your time will be on the street, if it's going to be on the track strictly then I'd probly run the 850.
But the 750 will give better throttle response on the street over the 850.
I know a guy running a 650cfm mighty demon on a 408 stroker and he said he switched to the 650cfm mighty demon from a 750cfm holley and he said he noticed a huge improvement in throttle response. I don't know his camshaft spec's. But he built it for a 4x4 truck.