Check out the TheDieselPage.com. They have an engine swap in progress (I think it's mostly done). You may need to be a member to see it, PM me and I can try to get more info for you.
You will need patience and money to do this swap. Make sure you get the computer, all the electronics and the entire wire harness computer forward. The only automatic trans that will stand up to it is the 5 speed Allison. You can get some hurking hp and torque number out of these engines. Stock is 320 hp, 520 ftlbs @ 1800 rpm. The torque curve stays at that level to redline @ 3,100.
The best fuel mileage I got on mine was 22 mpg running empty over a mountain pass at 60 mph, 7,000# truck.