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Don't use an HEI with an MSD ignition module. If you're going to run an MSD ignition, run the ditributor,cap & rotor, wires coil and module. If you use a stock HEI with MSD 6A you're wasting your time.
Or the performance KMJ unit you posted earlier + 6AL box? (this is what I think txchainsawgogi is planning) My understanding is that the 6AL replaces the module.