Would never have expected to see a different car on the line. I thought they would all be firebirds.
Looking at the lines on the trunk, where the lock is and the roof line, I'd have to say a 1969 Caprice. And after having been in the Arlington GM plant a few times, I've seen hodge-podge lines of Escalades to Yukons to Avalanches to Suburbans, varying colors and trim packages.