What's it worth? What's it worth Restored?

[MacGuyver31]

I am buying a 1964 GMC Truck with a straight 6 and 3 on the tree, with only 88,000 miles, the truck is in great shape for it's age, and also the original owner purchased a kit in the 60's to make it a dually and added 2 additional gas tanks, and the bed is only rotted out in the front two corners, other than that the truck is again In great shape, what is the approx. value of it now, and what could be the approx. value if I full restored it? And also it has very minimal rust!