Welcome to Cruising Forum.
If you can't arrange anything beforehand, stick your head
in at Morro Bay Yacht Club. Friendly place where a lot of boats in transit stop. A lot of boats use Morro Bay (note the spelling) as a jumping off point for the overnight bash to Monterey, and my guess is that 90% of them plan to motorsail that stretch.
If you're still unable to find a crew spot, Amtrack runs from San Luis Obispo to Salinas. Trip takes about 3 hours.