I am new to cummins and diesels in general. I just plucked a 12v from a 94 dodge 2500 p/u with 272k on the clock. THe truck did not look damaged at all, which leads me to wonder about the condition of the engine. What are things to look for/ things that should be rebuilt/ addressed before dropped in another vehicle? i am well aware of gassers an wouldnt hesitate to jump in one, but I'm a little cautious of cummins.