I bought a '70 Firebird Formula 400/4speed/12 bolt that had been a San Francisco car it's entire life. The car would roast both rear tires in second gear and would pull most of the San Francisco hills in third.
Like was said above they rust from the top down!
I had the rust in the top repaired around the C pillars, A pillars/dashboard along with a brand new windshield to seal it from the elements until I could get to it. Like this seller, I had no garage, covered parking is expensive and I had to move it weekly for street cleaning so, I couldn't take it apart.... for 7 yrs!!
I bought my Fury and then happily sold it!
This '67 wagon is a cool car and yes, probably rare, would be nice to have but, I won't go through that again!!