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It must have been 40 years ago that I had a similar problem. Car would run fine and then just stop with no spark. Cooled off and ran fine.
We changed the coil and problem was solved. Apparently, the coil would develop an open circuit as it got warm which would close when it cooled off.
I don't know how you could test your coil to duplicate this failure mode, so I think you should try another coil.
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