Car pack is up on the doc for the Mille Miglia Event tomorrow (as is the track pack - which you need a password for that is released tomorrow slightly before the event but pre-download it so you have it). I've put up a test server on the Nordschleife for you to try out your car or someone elses if you feel like it and to confirm all my settings are working as intended.

REMEMBER FOR BOTH TRACK AND CAR PACK TO INSTALL MANUALLY WITHOUT THE HELP OF CONTENT MANAGER! IT IS IMPORTANT THAT YOU OVERWRITE ANYTHING YOU MAY HAVE INSTALLED ALREADY!