We have the GMPP HEI dizzy (Part Number: 809-93440806) in a mild 350. Has about 3000 miles on it. Last nite it would not start, and we swapped out the module with one kept in the trunk as a spare. Friggin Chinese junk! The spare was a GM from the 70's and now it bogs down above 4500 RPM's. Redline is 5500 and it was pulling fine before the no start. Whats reliable these days?
Most all modules are made off shore and have omitted circuits etc!!!!!! Even the Delco module is not really like the old ones. The only place i know to get a quality orginal module is off a orginal (junk yard) hei distributor!!
failures of most ignition control modules can be traced to a bad coil, the windings short out allowing to much current to pass through the transistor in the module to overheat and sometimes burnout, could be what you have going on more voltage is required at higher rpm
One thing that does contribute to the modules life, it needs the heat-dissipating grease under it. Many do not have this, or the grease is old and dried up where it does not help conduct the heat out. This is not dielectric grease, it is a special heat conducting grease. Sorry I don't know the exact name or source.
MSD used to sell a pretty good control mod to replace the smogger module. They also sell an external coil kit to help you avoid frying a coil. The last HEI that I had is now an oil pump primer. If you want to spend the money and an HEI is a must have for you DUI sells a good unit or they did.
We have really good luck with our HEI Module's (PerTonix) and we even now offer one with built in Adjustable Rev Limiter and Multi Spark. No matter what one you go with, the importance of the Anti Heat paste can not be over stated. https://www.summitracing.com/parts/pnx-d72000
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