Ooh, this one's a no brainer.
My favorite classic car is a 1969 Camaro Z28 with a DZ 302 (aka, a factory Z, not a clone!) and a Muncie 4-speed tranny. Preferably in Hugger Orange, but I'd take one in any color.
I also like the '69 Yenko Camaros. Actually, I like Camaros. Period. I'd love a shot at driving the "Crusher" Camaro that was one of Hot Rod magazine's project cars. That was one bad-ass ride.