Do your homework to make sure it's a real, legit SS. There are codes to look for on the trim tag on the firewall to tell if it's a real SS. For that price it's most likely a 327 car that somebody slapped some SS emblems on. On the trim tag, look for the line that begins with a "4" like this:
There should be a "4P", "4N" or "4K" if the car is a real SS. The "4P" could be a 327/275 hp car though so it gets tricky. But I would assume it's not an SS and if it's still a nice car then it might be worth buying.