What should I ask about, look out for?
Check with the owner about oil consumption. According to GM, it's "normal" for these cars to use about 1qt/3000 miles. GM also says piston slap is "normal". Listen to the car on a cold start up. Piston slap will sound similar to a deisel. If this is really really loud, or does not go away within 10 minutes or so, you may want to see what the owener has to say about it.
If, by any chance, this car is sitting on the VW lot at Dixie Farm and 45, run. I got mine from there and it turned out to be a POS. I'm just about done with the rebuild though...

