Anyone who knows for sure if the cylinder heads from a 1996 will fit to a 1994? And are the cylinder heads equal on the "F" and "S" engines? Reason for asking is that I've got hold on two NIB GM heads originally ordered for a 1996 "S" engine. Price is very reasonable but if they don't fit I don't need them. Thanks a lot if any of you could answer this one?

They'll fit fine. The precups will have smaller openings than the F heads.