[Razorback1980]

Blocks are fairly interchangeable but bolt-ons are different. If you buy an early vs. a late, then you will have some swapping to do. The other differences in the blocks are the automatic tension adjuster for the timing belt. Some people seem to like them and some people hate them...personal choice. Other that what is already mentioned, that is all I can think of.

Hey Art, Please put your car in your signature line so we can better help you. I'll post a list of some engines I know about if I knew what year car you had.