Get the VIN and the Cowl Tag info and post if so it can be decoded Also get the engine code and the partial VIN off the engine pad in the same area, If you know the guy and he really has a 67 RS and only wnats 2 grand for it go for it. A plain Jane 67 RS is worth way more than that without it being a Z28. If it is in fact a numbers matchin 67 RS/Z28 you could be taken to jail for stealing it so cheap.
ALso get a hold of Denis here on the site or visit his site as he can give you all the info you need to figure out if its a true 67 Z or not.