Chances at top schools (emory, vandy, tulane) with a low GPA?

IMO pick one or two reach schools and then focus the rest of your time on schools that match your stats and safeties. (Which should be what everyone does).

Look at schools where the weakest part of your application, your GPA, will be the norm. There is a thread for B students in the parent forum.

The schools you listed are not going to overlook your gpa.