I have exactly the same thing going on except I have Pertronix. I talked to their tech today and they recommend to try a 10k, 15k or 20k ohm 1/4 watt resistor placed in the tach signal wire. I have them on the way to try. Not sure if this pertains to the stock pounts setup but if it works I will let you know. BTW you probably have a resistance wire from the ignition switch to the coil which will affaect voltage to the coil when in the “run” position to help keep the points from burning . This wire is bypassed to give full voltage when the ign switch is in the “start” position to allow full voltage during start up. I have been reading for days trying to figure out how to stop the bounce ! If it works I will let you know
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