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Vapour Lock - ?

My cars been doing well for the past year but this summer seems to be having an issue. It's a box stock 72 with the 351C, no real upgrades.
The car starts fine but if it's been running for a bit and then you shut it down it won't fire up again until it sits for awhile.
I can only presume it's a vapour lock issue as otherwise the car runs fine.
The question is while all of a sudden and what's the best permanent solution - an upgrade to an electric pump, a rebuild of the existing pump or simply get a new one (presuming it's not a rarity) and bolt it in?
If I go an electric, what are the issues on fuel pressure regulation for the Holly carb as I'm not running a pressure gauge to be able to monitor or set a limit switch on the pump
Confirmations and thoughts appreciated

thanks
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