No spark after ingition module replacement

Ok Mopar GURU,s

I have a 1973 Duster with a 318, Auto trans. I have the notorious goo running from behind the ignition module. Preventative maintenance dictates a change before failure. Keep in mind the car is running great with this module installed.
I bought a replacement from the local auto parts store and changed it out. Tried to start the car and it just spins with no spark. I took it out and cleaned the ground contact areas and reinstalled it. Same no spark results. Reinstalled the old one and it fires up immediately. Took the new module back and ordered another one. It came in and I installed it, same no spark response as the prior new module. Back to the auto parts store for a new ballist resistor, installed the resistor with the same no spark response. I reinstalled the old gooy one and she fire right up. The old one and both new one's all have 4 pins at the plug. Any ideas???
Thanks