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I too am having a fuel boiling problem with my Speed Demon 750, but not when running. After the car is shut down hot, the bowls absorb manifold and other underhood heat. I am going to install a spacer, but for now I run the fans manually for a few minutes to remove underhood heat. This makes a huge difference when the car is restarted. Your problem sounds like float level and/or heated fuel from the line. Immediately after a drive, my carb float bowls are cool which indicates plenty of underhood air flow. Check yours, if hot then fuel is picking up heat elsewhere. Good luck in your efforts.
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