Got a HEI for my 65 6 cyl. wagon and installed it this afternoon. It won't fire the engine. Luckily, I have HEI(working) in my 63 wagon. I exchanged the firing module and the 65 works in the 63, not in the 65. I exchanged the cap assembly and rotor from the 63 to the 65. The 63 runs but the 65 doesn't. I rechecked the orientation of the cap in the 65 and it,s good. Put a plug on one of the 65 spark plug wires and turned the engine over. No spark. Recheched the 12v supply wire and it has 12 volts when ignition is on and when cranking. Basically I have all the HEI parts from the running 63 wagon on the 65 except for the dist. itself. The 63 works with the parts removed from the 65. What am I missing?