Bring a flashlight and crawl up under the dash and look up towards the wiper pivots. The seals that go around pivot shafts dry out and leak water down to the carpet, which then leads to rotted out floors due to damp carpet. Passenger side pivot will be a challenge to see because of the heater box. Also look at the heater valve for signs of corrosion. They can be rebuilt but expensive. When under the hood look under the black rubber cowl flap on the passenger side to see if its packed full of debris, if it is really look at he seams on the cowl itself for signs of paint bubbling. When you open the passenger door there is another dust flap on side of cowl, this area tends to get plugged up with debris, but its hard to access. Also when in the trunk look up under the filler panel between the decklid and back glass, the chrome trim likes to hold moisture and they rot out in that area. Pull up trunk mat and look at it, because of said window area leak, water will rot out trunk floor due to rubber holding moisture.
If you have a mirror on handle I suggest to bring it to help in those tight areas.
Yes the trans is a one year only cable shift (regardless if its column or floor shift, the nice thing is tailshaft is now a slip joint rather than the ball and trunion set up. Rear axle will be the standard flange set up, last year for tapered axle was 64. As any car you intend the purchase take your time bring a jumpsuit and be prepared to crawl under it. Bring a magnet and a fiber cloth rag and ask owner if you can apply to typical rust prone areas to see if there is excess body filler.
Best of luck, let us know how it goes.