Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The game against UC Davis was part of an "All-UC Doubleheader" that was held annually from 1948 to 1963. The other game of the double-header was California vs. UCLA. The games were always held at the home stadium of either Cal or UCLA.
References
Howard Hagen (October 27, 1963). "Aztecs Crush Gauchos, 42-14". The San Diego Union. San Diego, California. p. G-1.