With a 503 MCAT, you're circling the drain for MD.
I suggest:
MCW
Loyola
Rosy Franklin
WVU
Uniformed Services University/Hebert (just be aware of the military service commitment) [maybe]
TCU/UNT
ALL SUNYs
Any DO school. I can't recommend Nova, Wm Carey, WCU, BCOM, ICOM and LUCOM, for different reasons. MSUCOM? Read up on Larry Nasser and you decide. LMU has an accreditation warning, which concerns me. CUHS is too new and appears to be too limited in rotations sites. UIW refuses to post their Boards scores, which is fishy.