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I believe your timing tape is off. Make a piston stop that fits in the spark plug hole and find true TDC and mark your balancer. Also (your not going to like this) pull your intake manifold and block off the exhaust passages that are allowing exhasut gases up under the carb. I can see by how the paint is burnt off the manifold it has exhaust gases heating the base of the carb. With an electric choke there is no need for any intake manifold heat.
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