I have a 1972 Plymouth Scamp that's been sitting for 25+ years, how much is it worth?

Brand new here, hopefully I am posting in the right forum. A few years ago my grandpa gave me this 1972 Plymouth Scamp. He built a shop at least 25 years ago and told me he drove the car in this shop, parked it, and it hasn't moved since. Unfortunately he passed away last year so I can't get any more info on the car. All I know is it's a 6 cylinder, the body and interior are in good shape (except for the roof), and I don't remember the millage off hand. There's no sentimental value to this car and I want to sell it to fund another project. I live in Montana, what could I sell this car for? I only have 1 picture of it right now, but can get more once I get it unburied. I also have the title in hand and the last time it was registered was back in 1981.

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