[Gaz64]

Two of my cars have Webers and both have electric pumps and return regulators.
I never have hot fuel handling issues.

I would be removing the mechanical pump and your dead head regulator, installing a return line and running a bypass fuel system similar to EFI.

Fuel delivery is much smoother, the carbs are happier receiving the cooler fuel flowing without pulsations.

Wondering on why you wish to keep the mechanical pump?