As long as there are no real reasons you should not have full custody, then I'm sure you will get full custody if husband moves to California. It shows he is not concerned with staying somewhat close enough to have "real" time with his child. I could understand if he was taking this job "for his family", but you stated he is already thinking about when he can have the child meaning he doesnt have the "family" in mind making this decision.
If he moves that far, I dont think you will have any issues on this topic.
-------------------- "...And what a beautiful mess this is
It's like picking up trash in dresses..."