Tell me about your ballast resistor failure.

bee1971 said
So why did Ma Mopar keep the .5 OHM Coil side of the dual ballast resistor open when they first developed the electronic ignition

Then at some point in the mid 70s switched the Coil side of the dual ballast resistor to 1.2 OHM and sealed it

Good question.
If we knew what year, there's probably a bulletin.
My initial guess would be lean burn, but you say its the same p/n, which would certainly be changed with a new design.