what size master cylinder bore?

Spoke with Wilwood today. They need your brake pedal ratio and the piston sizes in the calipers and or wheel cylinders. I have the 10" Abody 10.75 front disc kit and 11" Dana rear(1.8754"). They suggest a 15/16 or 1" bore MC. I found a slightly used Wilwood MC 260-13375P with 15/16 bore for $99 on Ebay. With see how this goes. Thanks guys.