Diesel engine swaps

I like the idea of a C body diesel cruiser, too. If the electronics weren’t such a night mare, my first choice would be a Cummins V8 out of a Nissan Titan XD. Set up with a 518 or 46RH automatic with a towing converter and highway gears it should make a good highway cruiser.
the electronic wouldnt be as much of an issue as one thinks... the Cummins, as with all their engine, use a stand alone ECM that is seperate from the chassis computer on the vehicle. you'd just have to have the program or find someone with the programs to turn off the parameters inside the Cummins ECM that looks for the feedback from the trans. literally a click of a mouse.