AC time trial server is still running Monza 1966 with the Lotus Type 49 if you want to set a time. Going to switch it later this week, let me know if you've got any requests.
It's all official base game content, no DLC or mods needed this time around.
server: vrg time trial
pass: tfwnodriftfu
leaderboard: http://198.23.223.127:50041/lapstat