The number in brake names Usually refers to the drop. I think I remember (this is shaky, not Gospel) that 750 is the max drop, but even if it's the middle, you'll be at the limit. Width won't be an issue, since the arm span is comparable to seat stay width.

Also keep in mind that because of the relative positions of the crown and rear bridges to the wheel radii, front brakes are usually closer and rear farther than the reach measured at the mounting bolt.