My son played for the SoCal Cardinals and knows kids who played for the Cubs. Coming from Santa Clarita would work for both of those teams. I also think the A's are in the SF Valley and would work also.
All of the tryouts are pretty competitive and only the top kids make the fall scout team. I am not sure about the Connie Mack teams. The new Connie Mack league was just starting when he played and he played for the D-Rays in that league.
Let me know what specific questions you have and I can probably answer them.