Do I even stand a chance? UF, UVa, UChicago, Northwestern, UNC Chapel HIll, Emory

The OP might take a look at the following link which displays the acceptances and rejections for UF graphed by GPA and ACT test score. Applicants with GPA’s below an unweighted 3.5 had a very hard time getting accepted despite the strength of the ACT, while those with a GPA greater than 3.5 generally got in despite poor ACT scores.

http://www.collegedata.com/cs/admissions/admissions_tracker_result.jhtml?method=selectCollegeWithDefaultYear&schoolId=943&classYear=2020&profilesCount=678

If the OP spends some time searching for schools that give a preference to the ACT, I am sure they can find some.