well i rebuild engines at a company we ship them out to all over the U.S. but i drive a 97 camaro with the 3.8 its a quick little engine but i believe the 4.3 is what u r looking for the heads on it look just like a 305-350 but ofcourse 2 less cylinders... the 4.3 has more aftermartket performance parts than the 3.8 as well i know because its hard to find parts for mine thats y im not keeping that engine.... well if u need anymore info id be glad to get it for u... or if i know i can tell u...