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And since the value of some trucks, like the Flaresides, vary by region I would look at Craigslist. But, if theirs is a real gem then don't limit the advertising to local media. A very clean, rust-free truck is frequently worth driving quite a ways to acquire.
The Kelley blue book website doesn't go back that far. But NADA does.
It says low end retail- $1500. Average- $3350. High retail-$5600. That is when I plugged in my zip code. It will vary from region to region.
Like they said look at Craigslist in your area as well as autotrader.com,
classiccar.com and others to get at least a ballpark figure.