So, after about a month of putting this old black bird into service as my daily driver, I've filled the gas tank once and averaged 18mpg under mixed conditions. On the whole, the car has performed admirably and continues to amaze me. No, the a/c didn't spontaneously come back to life, however the left turn signal indicator did, which made me endlessly grateful that I don't have to try to replace it.
Today marked its first return to the shop to correct a minor brake line leak at the rear passenger wheel cylinder, tightening of the front driver side suspension, and replacement of the power steering and fan belts. During driving, I noticed that the power steering would occasionally start to hiccup or stutter which caused us to check it. We found that the power steering belt had over 3" worth of flex to it. After discovering that there was no adjustment that could be made to tighten the power steering belt, we opted to replace the belt since I had almost two spare belt sets lying around. After removing the old belt, we discovered that it still bore the original AMC logo and markings, with a date code of 1186:12!
This leads me to believe that this old Dayco belt survived intact for 26 years and was still (somewhat) viable when it was removed! Amazing!. I'll attach a photo of it once I get it uploaded. Guess they just don't make them like they used to haha.