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No spark on 440, all ideas welcome

RTDaddy

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440 HP with purple shaft cam. Motor has been running for years, but come this spring will not start. Running Mopar electronic ignition, replaced control box (orange to chrome/Mancini), replaced coil, replaced distributor. Coil shows voltage on both positive and negative with key in run position, power is on coil with key in run/start position. Motor spins over when trying to start. Anyone have a reliable method for bench testing (out of the car) the distributor and control box? About set to go with a dual point distributor.
 
Pull the distributor and spin the shaft. With the key on. And a grounded spark plug hooked to the coil lead.

Look for sparks.
 
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