So I assume that you are using a Mopar electronic ignition?

I agree with the bulkhead as being a strong suspect.

I also assume that you have a ballast resistor with just 2 wires. Without removing the ballast resistor wires, I would run a jumper from the positive side of the battery to the ballast resistor (end that has 2 wires connected to it) then try to start it.

If it fires while cranking, then it does point to a bad bulkhead connector. I suspect it will fire.

Unless I'm worried about full originality, I splice wires on both sides of the bulkhead for both the high amperage wires. I remove the brass connectors, run a drill through the plastic connectors and just run the wires straight through. Have done this on a couple cars now very successfully.