1963 Buick Wildcat
I looked up the car on wikipedia since it sounded like a cool car. I see that I owned a '64 Buick Wildcat for about a year when I was a kid (a very long time ago in Germany on base.) I paid $150 for it there. No muffler, a lot of fun, and it was fast. I gave it away when I left. I know, the Skylark was way better.
on edit: i meant add that we never got to see the car in the movie !