What are my chances at CSU Fullerton and SDSU?

CSU GPA: 3.56
SAT Score: 1380 (710 English + 670 Math)
Intended Major: Mechanical Engineering or Political Science
In state but not local

They admit by eligibilty index and major.
(CSU GPA x800) + (SAT math + EBRW) so your EI is 4228.

CSU Fullerton: Solid Match
SDSU: Match.

Best of luck.

agreed - you are a very strong candidate for both.
good luck