1971 Road Runner. Somewhere in the past it had a MP ignition distributor, coil and ECU wired up. It is an orange 4 pin ECU but was wired to a 2 pin ballast. I am COMPLETELY rewiring the entire car with an American Autowire update harness kit, that calls for a 4 pin ballast. I just discovered that the orange ECU is a 4 pin. Since everything should play nice, I am going to continue to wire it like the schematic calls for, with a 4 pin ballast.

The wiring in this car was so bad, it is a wonder it didn't ignite something.