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It sounds like your carb is not adjudted right, the fuel air mixture was bad on mine as i am restoring a 55' , also on on the side there was a large plastic screw to set thr richness on it. I heard the engine improving as soon as i adjusted it, another idea is to google carb troubleshooting and see what popsup, this is what i did with mine, good luck,
ps, you made need a carb kit, as there are many variables
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