Hard HOT starting

Modern alcoholized, boiling, vapor lock. Parked hot, fuel boils, forces "over the top," and floods the engine and or empties the carb.

"What helped" alot on my 67 was a rear mount electric pump, a thick carb insulator, and a home / DIY return system. Used a Wix 33040/ 33041 filter which has a built in return orifice

You can get various sleeve / insulated tubing from Summit etc.