1968 Chevelle, not running what's it worth

anyone got a vague idea what a 68 Chevelle, bench seat, 307, silver with black interior, standard granny car is worth? It's been sitting in an old chevy dealership for 18 years, I'd guess the value is in the body for someone to restore, no rust or body damage, great shape but just sitting there.

Thanks!

More info, 2 dr? Auto, stick, color, does it run and drive?