It's got some nice goodies on it for that year and I have always liked that color.
2500 3/4 ton? I can't tell from th photos.
The great thing is that the selling price won't include any owner add ons that you may want to change. No $2000 set of wheels and tires that you don't like and no added frufru that you will have to take off to make it yours.
I'm so far off base on prices that I would be no help at all. The best I can do is say to check for similar trucks in the same condition on the usual places. Ebay, Craigslist, Hotrod Hotline and others. Oldride.com advertisers seem to think that their trucks are worth a premium
http://www.oldride.com/classic_truck...rolet_c10.html