Elec woes, crank, no start after running then parked.

Yep, makes sense.
I had to do some digging(google) to come up with SMP catalog. To be able to see what they list for my application.
I used a 72 Plymouth Duster with 340. I selected that app as I wanted something with electronic ign. No specs at all, altho all 3 SMP parts I'm using(LX101, UC12 and RU4). Whether they are "matched" or not, who knows lol.
I also downloaded a 72 Plymouth Service Manual to get elec ign oem specs for BR and any other related specs. Unfortunately no BR specs lol, but there are for 71?? But 71 isn't elec.ign...wtf.
In no particular order the things that I would suspect for an intermittent problem would be- ECU, resistor, coil.

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