Master Cylinder Size Help

[jeffandre]

I am trying to finish up my brake system but need help getting the right size MC. After careful consideration I have determined that installing custom pedals with attached MC's (like Tilton or AP products) will be way too much work than it's worth (would take me over 100 hours of tweaking to get it right, maybe more). I am considering a replacement MC for my 71 Camaro. I will have a better weight distribution than stock. Here's my caliper specs:

Front: AP Racing 6-piston, 27/32/38 piston sizes, 14-inch rotors.
Rear: C5 front 2-piston, 44.5/44.5 piston sizes, 13-inch rotors.

For manual brakes, what sizes bore MC should I try? I have heard 15/16" in some apps, but my rears are larger compared to my fronts than those apps, so should I go to 7/8"? Or do I have this backwards? Thanks for your help,