I don't know the book value, but it is hard to tell what it would be worth. It all depends what you want out of it. If the engine and drive train are strong it may be worth it. Also if it looks like it been modified (lifted) or offroad alot I would be careful.
I bought a beat up 78 bronco for $300 with no rear end and a $3500 bronco with new paint and rubber but no motor.