John, maybe this will help.

#1 Restored to current maximun professional standards of quality in every area or perfect original with components operating and appearing as new. A 95-plus point show car that is not driven.

#2 Well restored, or a combination of superior restoration and excellent original. Also, an extremely well maintained original showing very minimal wear. 85-plus point car.

#3 Completely operable original or older restoration showing wear. Also, a good amateur restoration, presentable and serviceable inside and out. Plus, combinations of well done restoration and good operable components or a partially restored car with all parts necessary to complete. A good driver.

#4 A drivable vehicle needing no or only minor work to be functional. Also, a deteriorated  restoration or a very poor amateur restoration. All components may need restoration to be excellent, but the car is mostly usable, "as is". Good driver.

#5 Restorable. Needs complete restoration of body, chasis and interior. May or may not be running but isn't weathered, wrecked or stripped to the point of being used only for parts.

#6 Parts car. May or may not be running but is weathered, wrecked and/or stripped to the point of being useful primarily for parts and will require extensive/expensive restoration. 

This car supposedly looked great. Buyer beware, often the seller has no clue what's hiding in there. Our friends at GM made really sure this area would be prone to rustout when they installed foam blocks at both locations (#2 body mount, behind the kick panels) Picture link:

http://www.corvettevalley.com/gallery/data/500/medium/birdca ge009.jpg