The GMC 5000 diesel was given to me by a local guy,I'm still deciding if I should rebuild the original diesel or find a retrofit like a 6bt cummins.Here's a link to a picture of the GMC 5000 diesel.
http://img.photobucket.com/albums/v312/bigtim44/photobucket-58435-1363235015871_zpsb947dc9e.jpg