engineering major and pre-med??

<p>I got accepted to Purdue’s engineering program and I am planning on going into chemical engineering but my question is that let’s say that i do get through it with an an exceptionally high gpa and great Mcat score; What are my chances of getting into Vandy’s Md/Phd , Columbia’s Md/Phd or Dartmouth Md/Phd?
Also what would be considered a great gpa and a great Mcat score?
Lastly, can anyone give me a few more great md/phd programs which i should start looking into from now?</p>