Is there any difference between an AC and NON AC firewall on a 72 Dart

[QdUOTE=RedFish;1970864729]case, controller, everything changed from 72 to 73. Either can operate without all the a/c components but... the heat/ac cases do have vacuum operated controllers which may not function well without sufficient vacuum. The heat only cases are mechanical cable operated.[/QUOTE]

Which is exactly what I am faced with.

Maybe I should just fixit up like my 72 340 duster, factory radio delete, heater delete. Lol