Sounds like you either have a carb problem, or something with the ignition. Since you seem to have dead, or mis-firing on the 1-8-5-2 cylinders, but the 3-4-6-7 cylinder are firing, it appears that you have one side of the carb not feeding fuel into the intake properly. Think I would remove all the plugs, and see what they look like.
I think you'll prolly wind up removing the carb and having a look at it, or just rebuild it.
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Joel Adams
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