Looks like your braided gas line is running too close to the front of the cylinder head, braided covering is probably picking up more heat than it is helping.
Try running a 5/16" steel line up from a factory filter at the fuel pump up to your carb. Then splice that in with a short gas hose at the carb. Or if you can get the right fitting at your carb run the steel line all the way into the carb.
Run the new steel line on the front side of the fuel pump to get it away from the heat of the head and header that is boiling your gas.
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