Engine only? There are two things to watch for:
1) Make sure you don't get a "distributorless" engine
2) The knock sensor will go unused, unless you drill and tap a hole for it (the boss is there, but it's usually unmachined 1991-up.)
Granted, there's a little more than that - but you can readily swap short blocks. If you want to go with the long block + add-ons, it's a bit more involved, since you'll have to adapt the TPS (if you have an auto, you're sunk. The RENIX auto uses a 'two in one' TPS...) and maybe the MAP sensor - the other sensors, I believe, swap readily.
Adapting the TPS has been covered here in depth before, and maybe the MAP as well (it could be as simple as taking the vacuum port for the MAP and extending it to the sensor on the firewall - I'm not sure offhand.)