Is there a resource for determining the value of older used cars?

I have two cars I need to sell. One is a 67 Ford Mustang in poor condition and the other is a 84 Ford Truck (no additional info, it's a truck) in just fair condition. I can find plenty of resources for determining the value of restored vehicles but I'm having trouble finding something for cars that are... show more I have two cars I need to sell.

One is a 67 Ford Mustang in poor condition and the other is a 84 Ford Truck (no additional info, it's a truck) in just fair condition. I can find plenty of resources for determining the value of restored vehicles but I'm having trouble finding something for cars that are heaps of junk.

Any help?
Update: kelly blue book doesn't go past 1990, but thanks.
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