[Excaliber]

I agree with Hal on the heads, intake and exhaust mods.
Your post indicated 75 hp for similiar mods, a good conservative number! In contrast to the other bolt on goodies, 75 hp for THESE fundamental items seems on the "low" side.

Head, intake and exhaust is EXACTLY where the horses are found! Now, which ones and do they COMPLEMENT each other is the KEY! You do all that to a Ford EFI 302/351, for instance, and then expect the "stock" throttle body and injectors to "work" with the new mods, think again! Go with a 75 mm throttle body, 24 lb injectors, new mods and NOW were talking some serious HP gains. Got a carb? Same rule applies, might need to re-jet or get bigger.

How to find ALL the matching pieces to the puzzle is the trick!

Ernie