I mean, it's worth whatever a buyer is willing to pay, right? you can ask 20k, but it doesn't mean there's a buyer for it at that price. 8k is definitely the higher end of price. The condition certainly seems pretty good, but keep in mind your truck has the less desirable peugeot trans, no AC, and is a pioneer trim rather than top-o-the-line. to get 8k, you might have to actually pull back the carpet and snap pics of pristine floor boards. Moisture under the carpet is insanely common for these trucks and that rot is horrible to have to deal with. Paperwork and other documentation can help a lot in attracting the high end buyers, so flaunt what ya got. It's certainly not legal, but it is possible to fake the mileage in the old trucks. Oh, and the build sheet is sometimes found tucked under the bench seat or behind the drivers door panel.
but yes, you need to post elsewhere in the forums a few more times before the classifieds opens up.