i have had big #'s from a blown bigblocks . you dont have to spend big$ for heads or wild camshafts , because the blower does that for you . money well spent is on the ignition and carb or fi . i had a 505 ci ,brodix heads out of the box , off the shelf roller cam , 871 bds blower and a 4 port mech injection . it made way to much power for the street .this was in a 67 prostreet truck .
we did about 10 mustangs with forced induction they were very driveable , no problems and would run like a scalded dog !