Car Value & VIN Question

Before buying a car, bill of sale only, how can I verify it's not stolen beforehand?

Also......looking at a 1967 Plymouth GTX. What's it worth???

Factory 440 car, but no motor or trans. All glass is in tact, rear axle, tires and wheels

In fantastic condition. Sat inside a garage, on concrete for 40 years, very very minimal rust.

Also, no interior.........what would I expect to pay or what's the car worth in this condition?