Go for it!
In my mind, there's only 3 "road" cars that have a good shot at winning. The R390, which already won it, the ZZII, which is capable with a good suspension, and the Cien despite its shifty shifting habits.
The XJ220 would be a good candidate if it went on a diet, and the C12S 7.3 would devour the competition if it had some available downforce settings. Still the C12S 7.3 would be my dark horse choice to win it all.
The GTSR Viper and Ford GT rank up there as well, as do the W12 Nardo and NSX-R LMRC. All possible winners that would finish better than the mighty 1136 HP Speed 12. Its raw power only matched by the number of times it goes off careening into the wall. As fast as these four are, I don't think any stand a chance.
I'd be surprised if the Cien isn't the car of choice and even more so if something outside my list of 10 can win.