318 runs real load and shakes like crazy

Jax_1975_Dart said
It does have a 4 pin ballast resister and there’s all of the previous ignition wiring hanging out next to where the newer 5 pin ‘75 year ECU is ground to the fender.

Not sure you mean by all that about previous ignition wire

Does this clarify it?

67Dart273 said
^^Right. ^^ 4 pin ballast and harness will work with either 4 or 5 pin box

A 5 pin box MUST have a 4 pin ballast

if the wiring is set up with the two resistors, it doesn't matter whether the ECU is a 4 pin or 5 pin, for the system to work.