It's not realistic to give you a number without more information.? How rusty is she (floor boards, rear wheel wells, lower tailgate, door bottoms); is the chassis still straight and strong? Condition of paint, chrome, glass, gauges, upholstery, etc. etc.?? Is the vehicle? relatively "complete"?
What is the situation in your MetroMN area?? In my city there are almost no old-car-interested people left, and those that are still interested are in their 70s and 80s, mostly beyond it.
PuN