Its hard to say without looking at it, but it looks like it would need a lot of rust repairs done. I would almost guarantee both the floor pans would need replacing and probably the frame rails too.
Then all the little stuff like trims around doors, rubbers, bushes etc need replacing, engine probably needs rebuild. A new/recon dash will set you back about $1000 bucks alone if you need one.
It does need a heap of work and depending if you can do it yourself depends on the restoration cost.
Like I said, hard to guess how much its worth without looking or lots more photos, but in my opinion, probably not worth more than maybe $1500 because its just a starting block for lots of work.
Others may say more many will probably say less.[/u]