I used to drive an NPR. Mine was a 2000 (I think) with the 4.7L turbo 4cyl. They also made a 5.2L turbo 4cyl. I seriously doubt you could shoehorn that into the Troopers engine bay, and if you did, you would have to seriously rework the front suspension as they are HEAVY bastards. I've delivered quite a few of those engines (as well as International
DT466 motors). The 5.2L is at least...