Identify this Duster year?

My Brother was out tooling around on his bike and found this Duster sitting in the weeds not far from me here in Arizona.
It say's Duster 340 on it, and my Brother talked to a woman that said "I don't see why we shouldn't get rid of it, no one is going to do anything with it".
He is waiting to hear back from the legal owner to find out what the deal is.
He also said it has an engine in it, but no carb and it is open to the elements but he could find no rust on it besides small surface spots.
Apparently the right front fender and the right door have some body damage, but the glass is all good.
Interior looked modified but ok.

Do you Duster owners know what year this thing might be, and what might be a good price range considering it may not even have a motor at this point?

Thanks guy's.