master cylinder for vette brakes

[sacarguy]

vete pbr fronts and 02 camaro rears.

what master cylinder bore size for manual master cylinder.

i plan on installing a billet master cylinder just wondering what bore size i should go with.

i was looking at this cylinder so i can adjust the rear bias

http://www.abspowerbrake.com/images/...557_masCyl.jpg

the center one 1373 wich has the porpotioning valve built in for clean plumbing

i just need to know what bore size to run for manual brakes with these calipers.