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Message: <blockquote data-quote="Pappy" data-source="post: 497995" data-attributes="member: 3278">Welcome to the forum!   Before you go much farther......The ignition system on that engine platform between 1974 through 1976 was a "bastard" ignition system. Was a first attempt at modern CD ignition. Was more of a problem than the simple points ignition was. There were many factory work arounds for it. To compound that issue the ignition plate was famous for wear resulting in an extremely loose fit and most required an ignition stabilization kit. That kit is NLA and has been for a long time. What this did was keep the plate stable and concentric around the mount boss. Once loose the plate moved side to side and would shut down one set of points or the other randomly. This sounds like exactly what you have going on. Best way to eliminate this would be to find a later model donor engine (CD ignition) and swap the complete ignition system off of it. </blockquote>