When are you thinking about applying? If you have bandwidth and it wouldn't be a significant financial burden you might reconsider taking the MCAT. Your score probably puts you at the bottom ~quartile of admitted students. Otherwise I think you have the potential for a strong application if you're able to clearly explain why MD/PhD makes sense for you. I'd encourage you to get started on the essays early to 1. Confirm this for yourself and 2. Allow time for several rounds of feedback