Mr. Gasket used to make a heat insulator that went between the carb and the intake, the help some. Is this on your Ranchero??? If it is, the engine compartment is small and has no room for air to exit the underhood compartment. Maybe a vent hole in the inner fender well would allow some of the heat to escape into the wheel well. On a 67 Mustang, I cut out a panel on the inner fender well and replaced it with a louvered panel I made. It did help.