From all the heresay over the years, I believe the Bondurant School of High Performance Racing is regarded as the best.
http://www.bondurant.com/
Willow Springs Raceway - not really SoCal
www.willowspringsraceway.com
http://www.fordgtforum.com/forums/showthread.php?t=17879
Your 2 weeks late. :bang
I wish I could have attended.