I've been doing a lot of research on the 4.0L as I plan to stroke and/or blow mine in a similar fashion to you. As far as I can tell, there are two models that you need to be concerned with. There is the 91-95, the 96-99, and the 00-06, although there is a great interchange of parts amongst them. For a straight plug and play, stick with a 96-99 block. The cam is interchangable across the years, but other things like the headers vary, getting a change in 2000.