get a Bosch Electronic coil (the black ones).
don't get bosch GT40 orange coils.
i've run the HEI with various standard oil filled coils, and even with an original small coil from a KE10. i used points to trigger also.
however, it is better to get one from a car with electronic ignition, or one that is designed for extended dwell.
you could limit the current a little more if you still have issues
sounds like you are on the right track tho
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