I would say a 33 is a good score to shoot for, and a 35+ will make you competitive.
But more importantly, how much research have you done? Reseach and the letters of rec that can attest to your skill in the lab are the most important factors in admission. You dont have to believe me, im just an applicant, but from what i've gleaned from the admissions folks i've met on interviews, a ton of quality reseach can make up for "average" numbers, but no grade can save your app if the school isnt convinced youd be a good researcher.
a good mcat score will help, the higher the better, but make sure that your research stands out.