Swapped the vent tubes. Same issue. Saw posts about the vent tubes inside tank saying the long tube in tank should be hooked to short tube outside the tank, and the short tube in the tank to the long vent that goes up in the trunk. Anyone one know if that is indeed accurate?

This is just the original 318, automatic trans, does not have electronic ignition, but points were replaced about a year ago with new plugs and wires, does have intake and Holly 650 with headers, other than that it’s stock.