Yes, diversity is good.
If I had the experience and knowledge that most of you do, I'd love to build my '49 4400 back up with a Cummins (and it would still be an I6

). A Detroit 671 with a blower and stacks would be really cool, too

. Or maybe even a Maxidyne!!! (I'll wait until Peggy lets me get a B-61 for that one, I guess...) But I'll be sticking with the '57 235 that was in it when I bought it. Call me chicken, I guess.
Regards to all,
John