Brake Master Cylinder Selection

[aggie91]

I am putting together my son's truck and need advice on what size master cylinder to use. I would like to use the stock '82 power booster, but I am not committed to that. If there is a good kit with the booster and master, then I would be open to get that.

Our brake set up is this:
Front, Corvette C5 two piston calipers with 13" discs.
Rear, Corvette C5 single piston caliper with 12" discs with mechanical parking brake.

What bore size should I use for the master cylinder? I want to keep power brakes for this truck. If I decide later to upgrade to a hydroboost system, can I use the same master cylinder?