Sorry to hear about your ongoing vapour lock issues.
I've read that bio-ethanol petrol can be more prone to cause vapour lock in older cars with carbs.
I also believe that super unleaded (98 octane) is less likely to have any ethanol.
It might be worth trying a can of super unleaded? Maybe run a fuel line from a 'temp fuel tank' just to try it, if draining your fuel tank is too daunting.
Just an idea to try.........
cheers, Peter
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