Thanks to all for the warm welcome!
I think my next step will be to inspect the vehicle, check the VIN for myself, and come back home and try to authenticate the car as a factory built GTO. If I like what I see, I will pop for the fax back PHS results to confirm the car's status. This car is factory white, with a black interior, AT, and the 389 motor. Not my favorite colors, but I can live with them.
The asking price is $26,999 on craigslist and $29,900 in the local paper. I checked the NADA Classic Car value guide and the asking price seems to be in the ballpark.
151 through Madison is not that bad, is it? Maybe since I have lived here and driven it for 20 years, I don't notice.