Obviously it depends on the area of the country, but I personally think it's worth in the $500-1k range. Looking at it objectively:
1. At the end of the day, 6.9 and 4-speed, single cab Nothing special. At least it's 4x4, which is worth something.
2. Crummy paint job, again, nothing special.
3. Interior isn't in great shape.
4. Still needs some work.
(I personally bought basically the same truck for $350, with it "not running"; drove it onto the trailer, advanced the timing and it ran fine).
Now, you might get more than that posting it in an area where there is snow, during snow season(now-ish). If someone needs a truck, they may pay more for it.