if it was me….
I would really clean up the whole oily looking mess of an engine……… certainly any part carrying electrical currents ..as suggested redo all connections from coil up to the boots clips… if need be install new boots with metallic wire crimped & folded back under the clips as suggested by mumbles
shine up.. polish all contact points and/or surfaces (retainer ring…… mag support plate coil grounds ( scrape all connection points and use star.. lock washers to bite into mating surfaces ) reinspect the mag plate plug wire routing
swap that lower coil/condenser/point kit to the top cyl position …we know it is good and never causes a problem
remeasure the coil secondaries for 4-7kohms from the boots to frame…. wiggle everything while measuring … see if it cuts out
reassemble the whole thing dry … no greases ..oil as a test … and keep that mag plate grounded as insurance
realign the coil edges on the mag plate
find a way to run that engine in the dark…3 a.m. if need be ………… look for arcing anywhere at high rpm when it fails
if all else fails make a nice trolling motor out of it !
..patience brings joy
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