I've got a RAM 3500 with the Cummins. I have put 200,000 miles on this one. It's the 2nd such truck I've had.
As a result I've done a bunch of reading and research on the 5.9/6.7 cummins. The headgasket is the first thing to let go, usually as the result of stretched head bolts. This is prone to happen even at relatively modest power levels. If you're turning it up at all, head studs may keep you from having to pull the engine out later to gain access.
At 290hp and 550lbs of torque, head bolts are probably ok.
Whatever you do , I watch with interest.