Well, the '74's are after emmisions went up and the muscle went away, the only 2 cars usable are the '69 and '71 Impala's, unless you don't mind lower performance but, you woulden't want a pontiac '350 cause Chevy is more versatile. How about the 318 or 360 out of a late 70's Dodge truck or car, maby even a 440 out of a late 70's New Yorker?