Ultimate old car in my book though, is the 289 Cobra.
Not the big 427 most of us are familiar with. The 289 was the 427's predessor and a lot more tame and but from what i understand, more fun to drive than the 427. Apparently its just a more balanced car.

Though its hard to deny the 427...is totally badass. And for a car that is 40 years old, it can still hold it's own against today's supercars.