If you could link some photos we could give you a better idea of what to pay. If this truck is just sitting and is missing a lot of parts don't overpay. To give you an idea of what you might be in for check out my gallery submission. There are links to the truck when I bought it in 1990 of 3K and also several spreadsheets that will give you an idea of what it might take to put it in the condition you want. My truck isn't even a daily driver yet as I am stalled out on it again for numerous reasons. My original goal was to have a nice looking daily driver but I'm still working towards that goal.
Good luck and keep us informed on your progress.