Likely not. The heater hoses are likely colder than the block. The exhaust is one big thing that causes fuel boil
Best thing I did for the 67 before I went EFI is a carb spacer/ insulator, block the intake crossovers, build a return setup (Use a Wix 33040 / 41 series filter with a built in orifice) and rear mount electric pump
Do NOT use the carbon canister (evap vent system) tube for a return tube. On the 76/ earlier cars that is the tank vent. Don't know about the Aspens