Anyone know the story of this?

The wagon is a 77 Buick. You can tell because the header panel around the headlights is tilted back at the top. The Chevys were never like that. You can even see the Byoowack fender trim on the driver's fender if you look close. It's a BYOOWACK. Probably with a Byoowack 350 under the hood. Most ALL GM cars cept Chevys got the Byoowack 350 for several years in a row in the 70s. I think they had a surplus of them. Some of you older guys will remember that.