Given Stanford only probably admits around 2-3 applicants from India in a specific year, I would say chances are very low for any applicant. If I have to guess, I would say those few slots go to national/international level award winners, whether academically or athletically. Here is an example: http://www.deccanchronicle.com/nation/current-affairs/301017/stanford-harvard-universities-vie-for-hyderabad-student-amita-gondi.html
While ACT score is great, your grades are a little on the low side for the top schools like Stanford and Ivies.
Here is another exemplary example of someone who went to Stanford (from India):
https://www.forbes.com/sites/anujakhemka/2017/08/04/from-delhi-to-stanford-visually-impaired-student-taps-altruism-to-launch-his-social-enterprise/#6d0da19b4338