@ammarhaider22
MashAllah it looks like a complete vehicle, which is great since you will not have to run around looking for parts.
pardon my ignorance but which engine is the diesel 3.8? are you reffering to the 14B (3.6, sometimes reffered to as the 3.7) or the H (3.6)?
i knew about the 4.1, 5.7, 6.6 & 7.4L petrol engines, not the 6.8. Even in diesel it came with 6.2, 5.7 and 4.0L engines as far as i know.
even the 6.6 (closest match) that was offered in this vehicle downright underpowered as it only pushed 150+ hp. a good swap would be a large displacemnt turbo diesel so that there woudl be plenty of useable torque to get this thing moving,.. something like a 1HD-T (or FT/FTE) (with an optional intercooler for more efficiency)