What ballast resistor do you use for the aftermarket electronic ignition system?

First off....YES, I did do a search of this. The info that I'm seeking wasn't clearly listed.
For years, various vendors offered a factory appearing electronic ignition conversion kit for these cars. It featured a distributor, a 2 pin ballast resistor, a 4 pin ECM and a small wire harness with the plug for the ECM.
What happens when you need to replace the ballast resistor? What is the OHM rating of that 2 pin ballast resistor?
Looking at a troubleshooting book that I got from...

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Author: Kern Dog