Value of 1980 Stepside Short box W/250 4x4?????

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Hey guys.Ill be honest,I dont know much about the trucks from the 80's.
I was hoping someone out there could help me out?
My uncle recently lost his job and asked me to help him sell his 1980 Chevy short Box,Stepside. The truck is a 4x4 and has a 250 inline 6 and a 4 speed tranny.He's put about $4000 worth of new stuff on the truck over the past year and he thinks its worth about $6000.I tend to think thats a bit high,but I honestly dont know.Below is a link to the craigslist add.So if anyone can check out the post and see what you guys think as far as price,Id appreciate it.....BTW:Truck in located about 60 miles south of Seattle if anyones interested in purchasing