Groove, depends on what kind of power he decides to put in that thing. The 5.9l Cummins has TONS of potential. I work for a high-performance diesel outfit called Diesel Dynamics and we have pickups with the 12v Cummins making 800rwhp on a dyno on just #2 diesel. That's about 1600ft-lbs and is daily driveable (except for tire wear )
When LT gets it together, I'm sure we'll be helping him put the power in. Hell, that rig had twin turbines in it at one point...he's not one to go slow.