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Maybe go to any parts store, or a friendly neighbors back 40 and get a regular old stock coil for a 60s 70s Ford pickup or whatever and put it on and see if problem persists, that would also answer coil heat soak question ...
Electronic ignition, like, Pertronix ?
If yes, are you still using the ballast resistors or resistor wire in the feed to the ignition coil or the distributor ?
If so remove them, run straight feeds .