Both are 12A. '83 is GSL, '85 is GS

I was able to talk to one of the local Mazda guys and he recommended removing the '83 harness (including the solenoid rack) from the engine and using the '85 harness. Something about the emissions controls advancing the leading and trailing timing separately in the '85.

I'll finish the rest of the mechanical R&R, then take it to him to finish the wiring and get it running.

Jeff