Since you can weld, putting the V-6 mounts in place to bolt up shouldn't be too hard. You have everything to do it having a complete vehicle. Stash the V-6 harness into the 87, you will have to do an external pump. Transfer case???? are those electric in those late models??? it's going to be an swap, but you have exhaust, wiring, you know it all works, you are ahead of the game there.