Since you have a computer... why not call Summit racing and get a program called "Desktop Dyno"
it will show you what horsepower theoretic pieces will make to a very close margin... usually within 10%... it will take the guess work out and allow you to make power with different head, cam, piston, carb combos.... and will allow you to maximize your performance dollar.... if you saw some heads on Ebay... this program would let you know what could be done with them in a matter of minutes... buddy have some forged flat tops he doesn't want???.. now you know what to do with them.... this program and shopping on Ebay or the Racepages make parts hunting and engine building fun... without the 'oops' of a poorly performing combo... money well spent...buena suerte amigo...make it smokin V8! -K