The NADA Guide (key word "Guide") is exactly what it calls itself - a Guide, not an absolute. When one uses the Guide, it's important to look at the narrative that defines each quality level. It's printed at the bottom of the web page and in the front of the actual book. Then, you need to appraise your car with "fresh" eyes - not the ones that saw your bride in the car on your honeymoon or your first born learning to drive with the car. I've found it to be an effective "Guide" for a "ballpark" price range. As I mentioned, it's not an absolute. For a look at values based on emotional ties, look at this site: http://www.hagerty.com/hccr/Auto/1971/Datsun/240Z/ And, as we all know, it always comes down to finding a buyer with the fever. Dennis