Master Cylinder size question

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Any brake experts out there? Wanting to run manual brakes on my truck and have a couple of master cylinder questions. I have c4 corvette brakes front and rear(twin piston front calipers, single piston rear calipers) - so, what size master should i be looking for? 1"? If i go with a two master cylinder set up, should the front and back be the same size or different?

Really leaning toward the 2 master set up with the adjustable balance bar from wilwood on a 180 degree pedal set up so the firewall stays clean.