Recommend an AC system for my 68 Barracuda

Do you have any more info, or maybe a write-up on how to make factory air work and be dependable? I have factory in my 67 Valiant. I have no idea if it worked, but I'd like to refurbish it if possible versus using a vintage air or other aftermarket unit. Are parts available to service and rebuild it?
@Machmeter1 did a stellar build thread- his A/C refurb starts on page 8, post 186; although the entire thread is good reading.
1969 Barracuda Fastback | Page 8 | For A Bodies Only Mopar Forum