Again, I am talking about your TYPICAL owner who might go to the strip. Nothing more, nothing less.
I think you are not quite grasping what a drivers race means (no offense meant).
Typical owners or average drivers will still heavily favor the GT500. An average driver in each shouldn't change the outcome. You could possibly win in the ZL1 IF a pro was behind the wheel while the GT500 owner was average.
Still would be a close race. But if both drivers are similar in skill (which is what you stated) then the ZL1 will lose, period. Of course, this is barring the GT500 driver doesn't miss shifts because then ANY car can beat another.
A camry could beat a GT500 if the GT500 misses several shifts.