Your SAT looks competitive, but your GPA looks on the low side. SLO rejected over 10,000 4.0 GPA applicants last year so it is a very competitive campus overall.
You can do a search on this thread to see if there are any MCA scores listed for Architecture majors to see how you compare:
http://talk.collegeconfidential.com/cal-poly-san-luis-obispo/2060363-2018-final-status.html