This place is 20 mins south on the coast in Luecadia. I think they are fairly priced (for San Diego), and they have done two small things for me and I am happy with their service.
https://scottsautomotiveandmuffler.wordpress.com/
In Oceanside, these guys have a fair reputation:
http://www.bandrbuggie.com/index.html
In Oceanside, this is a specialty driveline shop, but they would probably do a clutch. I haven't used them, but the rumor is they are competent.
http://www.oceanside-driveline.com/
This guy is 20 mins east of Oceanside, and I've heard he is into Pontiacs and fair.
https://dmacsautorepair.com/