FWIW, my MSD died a slow death until it completely died one day as I was, fortunately, just pulling out of the garage to meet up with my car buddies. I jerry-rigged a Duraspark I ignition box to get me through the rest of the cruise-in/driving season. I followed the George P. installation diagram and instructions to permanently install a Duraspark II ignition box as one of my winter projects in 2016. No ignition issues since.
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