The value in a car like this Maverick is if it lacks rust. It is not so much rust like you see on the thicker parts on the pictures you post. Rather it is rust on the thin sheet metal. Buyers will tolerate some rust, but not if it is extensive - especially showing on the rockers (under the doors), the floors and around the windshields. As it relates to the floors it is not only what shows under the car, but they can rot from the inside out, so look under the carpeting. Also a car considered rusted in the Southwest might not be considered all that bad in the rust belt part of the country. Assuming you are in Michigan it might be considered an OK car there.
Nothing on the car is rare of extreme value. So, I don't see parting it out as worth the effort. Therefore it would hopefully be lacking in significant rust and sold as a whole car. That said, the thin bumper cars are a lot more desirable than the late,r thicker bumper cars. And a two door car is more valuable than a four door car. You have the added benefit of the 5 bolt pattern axles and the period correct alloy wheels. So, in that regard you have those positive aspects going for you. I'd say the value is broadly in the $1,500-$3,000 range based on not knowing the actual condition. If you decide to sell it, price it fairly. I've seen $1,000 cars linger year, after year, after year on Craigslist with $4,000 asking prices.
Now knowing it is basically a Maverick a web site based on that would probably be more helpful. Regardless of what you decide please post back. I'd be curious to know the final outcome.