Regardless of what you decide about the needle/seat and float level adjustments also check the wear on the throttle shaft. The drivers side where you see the leaking gets more load as it is the side with the linkage and return springs. That side will wear more and many need a new shaft and/or bushing. Get with Dick Boneske or pontiactripower.
You could also consider heat isolation phenolic spacers under the carbs to reduce heat expansion of the fuel.
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