My first car was a '78 Aerocoupe Caprice. I still have it. As mentioned, all the suspension parts from 77-96 interchange.
One thing you might find interesting is that some of the Buicks had an extra bar on the rear of the frame that gave it extra stability (maybe the station wagons too??).
Here's my car in front of our family dealership, before the Government tore it down in 2009. The federal government closed us up and coincidentally the local government (which had a council full of corrupt idiots, literally) planned to tear the building down and put a building there. The building had been there since the 20s.