Dude, you had to pick the one engine that is as hard to source as a jet-drive is.
The Cummins inline-6 diesel is only available in the Dodge trucks. That particular model was once used as part of generating stations in the Canadian north: set the tach and those things will just keep chugging.
They do NOT like short-hop driving: that will unseat the valves and cost you a fortune in a very short time.
