I bought a car from a friend some years ago, with identical symptoms to yours, my friend accepted that he had to open the bonnet for a while, waft it even, before starting from hot. I assumed this being down to modern petrol being a more volatile, I thought about electric fuel pump with a return feed to provide cool fuel at startup, electric fan on radiator to over run to prevent heat soak and / or blast the hot air from under bonnet prior to startup, but did neither when adjusting the carb mixture cured it, it was miles out.
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