318 runs real load and shakes like crazy

67Dart273 said

5 pin. Forget that. If you have a FOUR pin ballast, (older) you need a FIVE pin ECU. A newer and improved (OEM) FOUR pin ECU will work with EITHER a 2 or 4 pin ballast.

There is NO way to tell a 4 pin ECU from a 5 pin by looking. Many 4 pin ECUs have 5 physical pins.

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@67Dart273 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. Are you suggesting I try an earlier year NOS 4 pin one off Halifaxhops or that I should be okay with the new 5 pin ECU off RockAuto? I do have an OEM NOS 5 pin for my /6 Dart that I bought tested from Halifax and, could pop in and see if that helps with the ignition firing.

Thanks again!