Just want to relate a problem my Father had one time. He had a 32 ft Owens with 2 327 Chevy gas engins. He had his mechanic tune them up. One run great, the other wouldn't even start. The problem was that the engins turned in oposite directions. I believe it was the left engine that ran CCW and the right engin ran CW. Is it possible that is the problem? Could one have been rebuilt with the wrong parts, for instance the advance may be retarding instead of advancing? Could the timing be set to 24 deg ATDC? Just a possibility.

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84 500 SEL (307,xxx miles)