Hmmm... diesel or gas.
Well, my thoughts are in the keep it simple stupid category....
If you can get a good mechanical engine, Cummins 6BTA with the VE or P7100, IDI Ford 6.9 or 7.3, etc.... or, even the 7.3 powerstroke.....
Anything else, there is just too much crap on it...... the only thing electronic on my engine, is the starter, and the alternator. My lift pump is electric, but, so so well guarded....
Other wise, unless you need the diesel for working.... I recommend sticking with a gasser....
Chase