Here's one for electrical gurus. Help.

That and you are (were) exactly correct.
This car came from the factory in 73 with the pickup wires backwards.
(Does it really matter?) It does if the rotor is too far away from the terminal inside the cap that the spark is supposed to be jumping to when the spark fires.
Usually we just go by if the engine runs right or not, but getting into it beyond that is a pretty big answer and best looked up for further information on checking and/or changing it.

This is a pretty good article on it.
Rotor Phasing


Note the brown with white tracer in the last pictures.
The "male" prong is supposed to go to one of the "forward/big end" sockets in the ECU plug.
This one went to the "rear/small end".
There are two sockets that are sort of further away from the front three.
Hey. I'm not an expert the black magic "PFM" of the ECU.
(I sent you a bad orange one years ago to do a postmortem on it).
My head is spinning.....FBO, HEI, FBO, HEI, FBO, HEI.
I've just been all over threads again trying to figure out what to do about my lack of good "old stock" Chrysler ECU's.
Plug and play and the warranty sounds nice on the FBO.
Trailbeast has some post where he talks about swapping the reluctor wires and phasing.
I put the wires back like they came in 73, backwards.
Hope that is OK.

Sorry if the red sucks:D