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Sounds a lot like the heat soak/vapor lock issue I've been dealing with on my car. If you're running a non-stock air cleaner, you might try a 1" phenolic spacer between the carb and the water jacket plate. Also, check to see if your fuel line is close to or resting on the manifold or block. If so, try to isolate it.
I'm still working on this issue with my car, especially after longer drives; I would love to hear if you find a solution.
~Steve
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