Sounds like a good deal, but I'd get a Carfax on it to check it's history for accidents, number of owners, etc.
Also, you might want to check to see if you can get the window sticker from GM from here:
https://cws.gm.com/vs-cws/vehshop/v2...NAAED8RG123378
Just replace your the example VIN # with the one you want at the end. Not entirely sure if this tool will work with older vehicles though.