Does anyone know if there is a difference in a/c and non a/c heater core and blower motor for a 68 X. I am trying to install a a/c unit from a jav but of course the heater side was pretty much destroyed in a crash. I have the center under dash unit and the electrical controls as well as the dash vents but the heater side was not salvageable and the yard would not let me have it for comparing without paying full price. It has since been crushed so I cannot even look for myself. Is the heater box different also. I have the non a/c unit from my car, can it be modified?