Modern fuel is terrible for boiling. Before I "went EFI" the best thing I did was to build a return system, use a thick carb insulator, and ran a rear mount electric pump. There is some evidence that Carter/ Ed carbs are worse than Holley, as the fuel bowls are "right down on the deck" and transfer heat from the intake, into the carb bowls.
At the time I even considered building something like a plywood spacer, 1/2" or so.