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And, put the Tri-Spark back and find the real problem!  One side failing is not a Tri-Spark (or Boyer or Pazon or any of the wasted spark systems) thing. There can be a bad spark plug wire or coil secondary and even a coil primary is possible but since both coils are required to have a circuit, one side working tells you clearly that the EI itself working! And, getting a Tri-Spark to work is way easier than getting points, condensers, ballast resistors, auto advance, and so on working.