Generally the cars built in the last years of production benefit from engineering and production line revisions, so the 90-93's are the best bets.

Check for rust at the corners of the car, the trunk and near the firewall. These are the sites of the rubber weeps and drains. If they aren't cleaned and cleared, they can get clogged with dirt and debris and cause rust.

AC systems from that period weren't particularly robust, with Nippon Denso compressors.