From what i have heard and read....
-Holley's are hell to get dialed in
-Demon is best bang for buck

Duoble pumper for stick shift, vac sec'y for automatic, as a general rule of thumb.

as for size...technically, a 650 floes enough ari, but if top end all out is #1, an 850 might be OK, but you'll give up low RPM power and some throttle response and streetability.