Ya I thought so lol. I’m in the same boat. Having a hard time finding a shop to test them. Do you have any more pictures and/or tips/vendors that will help me out?
For shops to do your testing, you'd need to pack and ship, but both of these places do great work on old car radiators, heater cores, and A/C evaporators and condensers-
Radiator Works, 18255 Parthenia St, Northridge, CA 91325 (818) 701-0504(ask for Marshall)
Ace Radiator
http://www.aceradiatorinc.com/ serving Fort Wayne, IN(original location), Columbus, OH, and Cincinnati, OH. (If you call in to Fort Wayne, ask for John)
For plating, Burbank Plating in Pacoima, CA
For insulation, call REM Automotive and tell them you want to buy a sheet or two of their stock they use to make the kick panel insulation. You'll have to cut this yourself with a sharp utility knife and a steel straight-edge. Change your blades often and do your cuts on a large piece of plywood, not the driveway or garage floor.
For the gasket and seal kit, Detroit Muscle Technologies
https://www.detroitmuscletechnologies.com/
DON'T THROW ANYTHING AWAY. ANY THING! You'll want the inside insulation backing to use as a template when cutting replacements. You're welcome.
Now you know everything! The rest is uncharted water and up to you how deep you want to dive. By the way, the last one I had restored instead of doing myself was 15 years ago by a place called SMS Restorations in New York (not the interior place but similar name). They charged me $1100 and said that's the last A/C box they would ever do. I still have their restored box installed in a car and it works great and looked great to me until I did my own with DMT's gasket set.