I would think that the HP/TRQ numbers would be probably a little above stock , perhaps 200-300 Hp and torque probably around that level too . It's difficult to say since ( other than the clean up bore ) no engine modifications are mentioned ? So I assume the engine is basically stock ? As for the body condition , he says it has the usual rust for that year car ? That doesn't tell you a lot ! " Usual " in your location can differ greatly from a different location such as Arizona ! I'd suggest looking at the car and taking a knowledgeable person with you . Sometimes as the prospective buyer , you tend to get wrapped up in what your vision of the car will be and you may miss or overlook obvious problems with the vehicle because you want it so badly ! That's where the knowledgeable person would step in and advise you ! Good luck and keep us updated !