In my opinion, you have to drive them when you can. Otherwise, I could use the garage space. In Feb of every year, (just before World of Wheels) we get the GT/CS and AC Cobra's in for our annual cleanup. Car goes on the lift, everything gets cleaned, touched up, undercoating checked, oil changed, - the works.
Currently, my brothers red AC Cobra is on the lift getting new powdercoating on side pipes and headers. We have pretty much taken what we can off the car to do a complete clean-up and restoration. The car is now 5 years old, so it can use alittle elbow grease.
Paul