I think that would be a great score.
Having to play devil's advocate here...I know you want to stay away from a "heavy" Cummins, but what about a
4BT Cummins? It's only a 4-banger (3.9L), but it would still haul your truck around pretty well, and should be lighter than a
6BT (5.9L).
My father-in-law is going to put a 4BT in a Jeep Scrambler he has one of these days. They are both sitting in his shop right now.
I think the 6.2 would be a good swap though. I think they are starting to come around and be more appreciated than they used to be.