Here are two more California Chevrolet dealerships who were doing business in 1969 that you can add to your list:
Washburn Chevrolet
614 Chapala Street
Santa Barbara, CA 93101
The Washburn building is still standing, and they were a Hi-Performance Dealership. You can find (via the link) some additional information and history to include their involvement in racing back in the day.
https://www.camaros.net/threads/wash...barbara.70951/
And another dealer doing business in the Santa Barbara area during 1969 was;
Dave Simms Chevrolet Inc.
4646 Carpinteria Avenue
Carpinteria, CA 93013
Good luck and enjoy your search.