Father-Son 1974 Duster Project

Could be in your ignition itself. Isolate all the external stuff first. I had the same problem on my red Swinger and on the Demon believe it or not. The actual ignition was bad in both cases. Kinda aggravating since I tore my column in the Demon down just like you. The Swinger column was mint so I never touched it. Just a pain in the ***. The wiring on these cars is fairly simple, but just not very reliable in my opinion. 50 years of jostling down the road just a pain. For the cost and time and piece of mind I am considering an aftermarket harness on future builds.