Looks like a really clean body. That side of the state gets little to no moisture (highland desert), so I'm sure it's as rust free as it appears. https://greatfalls.craigslist.org/cto/d/1963-buick-lesabre/6645885926.html
A good start to a car, too bad the market for LeSabres isn't quite as high as it is for Wildcats. This one would be worth a look if the guy doing it knew what he was doing and loved the car. Otherwise, it's a parts car to an existing one.
It Looks pretty straight and restorable, if it is still there when I move to Kalispel it might have a new home. Bob H.