Check your distributor gear, disconnect the 2 step if you have one, and make sure your wires are compatible with the ignition box you are running, solid core vs. spiral core. Ground the ignition box directly to the battery. I also had a high end miss which was traced to the alternator I was running.
Good luck,
Joe Martens B/Stick 3969
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Joe Martens AA/Stock 3969
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