The car was up in the foothills of the Sierras, a little dry maybe, but not too hot, and no smog. Looking at some of the bushing and mounts, it appears to me like most of the wear / tear and deterioration were from the first 20 years of use as a daily driver, not just from sitting. Apparently the "mechanic" that did some of the prior work, attempted to change the engine mounts, and was able to change the driver's side; it's the only decent looking piece of rubber on the car. He wasn't able to change the passenger side; he partially unscrewed the lower nut, but because the mount had already collapsed and trapped the nut, he wasn't able to completely remove it.
I'm going to try and get a little more history on the car and it's repairs from the PO. I believe she only had it for a few years before she parked it, but might remember what the PO told her about the car when she bought it.