One thing that comes to mind is that I think the stock wire to the distributor is a resistance wire that has a section in it that acts as a resistor. When converting to HEI, I think that resistance section needs to be removed. Maybe yours had a meltdown. Have you verified the power getting to the distributor?
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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