I don't believe there is a single correct answer to the original question. When I ran autocross, there were few modern cars I could stay with because the courses were so tight. I did much better on middle length tracks where top speeds maxed out around 100 MPH. They gave me room to use my power/weight advantage. On tracks with long stretches that allowed top speeds above 140, the Cobra's terrible aerodynamic drag was a disadvantage against modern cars with slippery shapes. The bottom line is that no one car is better than all other cars on all tracks. This Corvette C5 Z06 owner learned that a few years ago when we met at a track day event.
http://www.youtube.com/watch?v=nz7tLHkOiRE