AC/Heater assembly is out. I will be getting the whole assembly restored - probably by Mr Heaterbox who I've used before. Welcome - Mr Heaterbox and Interior Restoration Services
Before doing that I'm going to pull the evaporator out and send it to Original Air Group to have it restored (Mr Heaterbox does not restore evaporators.)
I'm also going to send the heater core to Glen-Ray Radiators to have it recored and restored Glen-ray Radiators - All New Licensed Mopar Chrysler Dodge Plymouth Radiators I havent used them before, but their quality appears to be excellent based on others who have used them.