69 Dodge Dart Cummins Build
I was at your dad's place before and bought a few parts from him, he was a good guy with some wild ideas! I almost bought an 82 Rampage when I was there, but already had a loaded trailer. If I were you I would use a Cummins 4BT out of a bread truck, if you use a 5.9 then like said above you may have to do a full frame as the weight of the engine is way too much for the stock frame. You can always use a truck frame and put the Dart body on it...