They are Tom Hampreys, Ed Mitchell, Rex Scates, Warren Golubsky, and others. This FAQ covers some of the questions which Steve's page does not answer. I highly recommend them. All of these are located in Sacramento.
Warren mentions American River, Sacramento area too.
It is a common opinion among car enthusiasts that you should not go to dealer if at all possible. I second Tom and Warren on that. However if you must, please read on. They tend to take a bit longer than a large dealership would. The parts guys are nice as well.