I don't know if the coil was changed with the 12v conversion, but I suspect it was as it was identical to a coil in a 74 GMC truck we had. Still, I did not see a ballast resistor and there was 12v at the coil when the ignition was on, so I picked up one at Autozone and installed it in series with the 12v from the ignition. I filed more on the points and put everything back together, and it started and ran smoothly. I'll have to see if that lasts. I'll see if maybe I need to change the condensers, too. In hindsight, the plug wires got changed as part of the shotgun approach to trying to fix the problem last Spring, and now I wonder if they were resistor wires before. Still, until I changed points it continued to miss then, but it had run well for the previous 20 years.
Thanks for all the helpful comments. Sometimes it is a bit of a mystery working on these 60+ year old machines, especially when they have modifications.
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