1957 Chevy Cummins Diesel Swap

[Tyler Dixon]

So here's the deal
about 4 years ago my grandpa bought a 1957 Chevy 3600. He eventually decided he wanted to use it to pull his 5th wheel toyhauler. He bought a first gen Cummins 6bt and the transmission. He has it set up as a 1 ton and this was all being put on a 73-87 frame. Finally he wanted to make it a 4 door by welding two cabs together or finding a real 4 door from the forestry, military or railroad. He has a ton of work put into the frame and mounts and everything. He eventually gave up on it after putting 5k into the whole project and getting nowhere.

Now I would really like to see this thing completed. Main problems he is having is the actual fitment of the engine and the firewall. Hes already cut the firewall and now he doesn't like how it fits. and hes already made mounts for it and has had the engine mounted in the frame

To anyone who has done this kind of swap what did you do? what are we doing wrong?