Well, my GM background is pretty minimal,but I think that the 2.8 and all accessories are a package as is the GM auto tranny it's bolted to. That 2.8 get's around. Jeep Cherokee's prior to 87, Isuzu's I'm not sure what year range(early 90's?).
I was doing some reading online last night and found that the GM 3.4 v-6 is an easy swap as is the 4.3 TBi unit to upgrade the 2.8 TBi I've got.