Actually Steve, those "fresh air intakes" are non-functional dummy items, all '64 Eurekas have them, even the Flower Cars. This was Eureka's answer to mating the leading edge of the '64 quarter panel to the sloping belt-line of the doors, a shape that was basically carried over from the '59 for the following five years.
My 64 Superior combo has a fresh air intake. To take it off I had to go through the rear heater core. So you are saying that it is "false" and not needed for combos rear heater unit? I wondered why they ever had them to begin with - what was their function?