It appears you have a gremlin. Sometimes I have noticed testing spark at coil wire isn't conclusive and testing at spark plug wire is more indicative. Try putting a spark tester in line between a spark plug wire and a plug and see if you have spark. As mentioned, the insulator where the small wire comes into the distributor is something to check. I know you have tested and got no spark inside the distributor, but just for grins make sure the cap isn't cracked. Wouldn't hurt to look at the plugs, even though you don't think it's getting that far.
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