@baekmeacak13 Hey man.
Well, the fact that I literally had similar stats as you and I got in for the 2014-2015 academic year gives a great possibility that you’ll get into Stony Brook as well. So don’t worry too much.Then again, improving on your ACT won’t hurt at all since it’ll just strengthen your application. Also, make sure you have a good Common App essay and great letter of reccomendations.
I’ll be happy to answer any other questions you might have/give any more advice. Good luck with your college app process!