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I had done some heavy searching here on TN in the past (year ago) when preparing to swap out a 5SFE in a 97. I had an opportunity to get one from an earlier model, but ultimately decided to stick with a gen4 motor (1997-2001). I can't remember all the details, but it was more trouble than I wanted to deal with. Yes the blocks are the same, but if I recall correctly (please correct me if I'm wrong), it seemed like the head needed to be swapped and also the oil pump (due to crank sensor maybe), and there might've even been a threaded hole in the block (anti-knock sensor maybe) that wasn't present on the earlier ones. I think I recall someone saying that you might not have to do all these things if you swap over the ECU to an older one.
This question comes up pretty often so it would be nice to get some expert advice.
I've heard of folks going the other direction, Gen4 motor into a Gen3 car, without too much problem but not so much the other way.
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