Car won't shut off

It uses a standard Mopar alternator, the same one used by every Mopar in the day. The only major wiring change is to the MSD ignition box, which removes the ballast resistor and also the ignition module. I have a custom dash with Auto Meter gauges with electric senders. That removed the old cluster with it's power connector issues as well. It still has most factory wiring beyond that. The vehicle also still uses the factory voltage regulator.