The truck was originally a 1986 chevy c20 2wd longbed with a 454 and automatic.  A month before my 21st birthday I started building the truck.  The body work included new cab corners and rocker panels, new doors, new fenders, and shortening the frame to make it a shortbed and putting on new bedsides.  The frame was shortened 14 inches behind the cab and 6 inches were cut off the back.  The engine and transmission are out of my 1994 Dodge 2500 2wd.  The drivetrain only had 402,000 miles on it when it was pulled out of the Dodge.  The injection pump has a custom fuel plate, 3200 rpm govener springs, and the timing is advanced.  The injectors are DDP 50 HP.  I dynoed it when it was still in the Dodge and it made 300 hp and 800 ft. lbs of torque but it didn't pull all the way through the dyno run because it smoked the clutch, so I assume it makes a little bit more power.  I fabricated all the engine mounts and transmission mounts myself.  I had to modify the core support so that the radiator and intercooler out of the Dodge would fit.  Bein 21 I did not have a huge budget to use on the build of the truck so 90% of the truck was built with used parts or parts that I already had laying around.  Very few things were bought brand new for the truck.  The truck is not perfect, but I am very happy with how it turned out.
http://www.youtube.com/watch?v=1J67FlNqZ_k