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I don't understand how I have sufficient voltage at B+ and there is no spark
Disconnect the B- cable and see if you have a yellow wire connected to the R terminal of the starter solenoid which is spliced into the ignition coil feed. While you are there, check the connections and fusible links at the solenoid. It sounds like you have a resistance wire feeding the coil and if so it would be a good time to replace that section of the harness but start by checking the above.