What's a '87 Silverado Worth??

[Roberty]

My uncle has a 2wd 1987 Chevy Silverado with the short fleetside bed. He bought it brand new and has taken very good care of it over the years except that it's been parked for the last 4 or 5 years in his garage and hasn't been touched. It's loaded option wise except it just has the fuel injected 305 instead of the 350. 90,000 original miles and It's red with a red interior. He's thought about possibly selling it to me but is unsure as to what it would be worth. Any ideas or comparable trucks for sale so that I can give him an idea? I've checked the local classifieds with no luck.

Thanks,
Robert