Correct Ballast resistor
So the next question is whether the 5206436 resistor measures 0.5 ohms or 1.2 ohms cold?
I wrote down 1.0 - 1.2 OHMs many moons ago
Definitely not 0.5
If individuals insist on running the single ballast resistor for upgraded electronic ignition systems on factory points type cars because of there wiring harness , why not just buy the 0.5 OHM Single Ballast Resistor from Hops and BEE done with it - Problem solved
It’s not period correct anyways because the factory used a 0.5 OHM Dual Ballast Resistor through the early to mid 70s on Chrysler Electronic
If you want a period correct Mopar Dual Ballast Resistor with the coil side of 0.5 OHM
Look for this , pretty simple as it’s clearly marked and has the OPEN ceramic back
However the same Mopar part number was used on the later ignition systems of the 70s 80s , and also was clearly marked 1.2 OHM and had the ENCLOSED ceramic back
You will not find a jobber or aftermarket Dual Ballast Resistor with a 0.5 OHM Coil Side
Like you said either way Single or Dual Ballast
0.5 OHM is the way to go