For UC, high school GPA (recalculated) is by far the most important factor. See http://talk.collegeconfidential.com/what-my-chances/1903428-faq-uc-historical-frosh-admit-rates-by-hs-gpa.html . However, the UC web page linked from there lets you see admission rates by residency (though not residency and GPA).
Different admission rates by only residency may not be that useful, since the strength of applicant pools may differ between the in-state residents and non-residents.