Looks to be a '62 long bed step-side.
What's It Worth? That really depends on where you are located and what you are after.
Long beds aren't as popular, from a re-sale standpoint, as a short bed.
The '60 through '62's had torsion bar front suspensions, not as popular as the '63 thru '66 coil spring suspensions.
All the above applies to resale. If you want to keep the truck, then resale may not mean much to you.
I'd say $2500 would be fair, assuming good solid body panels, floor pans, rockers and fenders/
Good luck.... let us know how this turns out!