A problem I had a few years ago, really furstrating after rebuilding the carb, but something clogged a jet causing no fuel to get to every other cylinder. You might try pulling the plug wires, one at a time and see which cylinders are dead. If every other one, you may have a clogged carb jet. Note, this only occurs with dual plane manifolds. Cured the problem by getting the engine running and slapping a cover over the carb. The engine vac pulls very hard at the carb jets and it pulled out what ever was clogging it up. Or take it apart and clean it again.
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