Westfield Promenade
6100 Topanga Canyon Boulevard, Los Angeles, CA 91367
the earlier the better. 8 am is about the latest because the bulk of the cars start to roll out about 9. there is a decent amount of cars after 9 but the higher end bugatti types of cars leave kind of early.
the site isnt the greatest but there is some videos on it.
http://www.supercarsunday.com/