Check where the ignition switch connector mates to the harness on the column. I once had a wire burn at the connector, leaving me with that exact situation. It was very apparent once I got up under the column. It was the heaviest wire. A quick wire repair, and things were back to normal.
Original door was smashed by someone who didn't know how to drive (hit and run). This occurred in the late 70s, when it was just an 8 year old Plymouth. Back then, originality was not a thing. I just bought one from a junk yard. It couldn't have been saved anyway..
Do you have this car? I owned it for 15+ years. I can clear up the door VIN issue for you. Where is it now? I have the original Thermoquad and the original dual point distributor...I hated that thing! Would love to hear about it.