Nadaguides.com values classic vehicles via a tab at the top of the home page. Edmunds and/or kbb allow you to evaluate a vehicle by selecting an option for a vehicle older than the years they list. Most recently, I have run my dad's 1970 F100 through Manheimgold.com. Like yours, it is low mileage and in great shape. He is its only owner. The values are way up there for it, but no one around here appreciates old trucks enough to pay that much for it. It would probably have to be put on Ebay or something similar to make the greatest number of people aware of it, and even then, who knows if it would bring in anywhere near what the guides say. Like someone above said, it's worth the greatest amount you can get someone to pay for it if you need the money more than you want the vehicle.