Last time I called Classic got put on hold for 40 minutes. Asked about getting original evap core reconditioned they said nope booked indefinitely go away and don't come back.
This will be going in my 73 Swinger that never had air.
Apparently they have a workaround for the off/on blower switch that is different between the 72 and 73.
Technically they only show the kits for 72 and back, but that switch is the only difference between 72 and 73 cars as far as everything else about the installation.