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I am pretty sure that the early duraspark's had a pickup coil inside the distributor, and the duraspark IIs had a hall effect sensor in there. The earlier units weren't used too long, and I think that they had an ocassional problem with the pickup coil failing when it got hot. Start and run fine cold, 10-20 minutes later it would fail like someone reached over your shoulder and turned teh ignition key off. 20 minutes to cool off, and start right up, only to repeat itself.