The stock fuel delivery system is vulnerable to vapor lock. You usually need a hot engine to create the conditions.
In order to eleviate the problem, the carb needs a superior heat isolator gasket, the fuel system needs a really good fuel pump.
It wouldn't be a bad idea to switch the fuel pickup location for the system to the bottom tank plug either.
If you are going to be stuborn and resist, you at least need to verify fuel pressure at the carb and check you fuel level settings HOT.
105? Ah that ain't nothing. The car doesn't know the difference. Only you feel it.
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