Make sure that both the ignition module and the pickup coil are original equipment GM parts- - - -not some offshore knockoff. The module in particular has some dedicated circuitry to limit current flow when the coil primary reaches 100% maqgnetic saturation. Aftermarket modules eliminate that feature because of the cost of manufacture. If I 'm forced to use one of the offshore clones of the HEI distributor for some reason, I trash the electronics and replace them with OEM components.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!