i personally have a chevy master on my current rig with a dual diaphram booster and i wish i would have just put on a toy 1in master..
my brakes aren't stiff or anything but it seams like i only have good braking for 3/4 of my pedal... i am hoping that converting the rear to chevk 1/2 disk will solve that issue
if it doesn't solve my currenty issue i will get a toy 1in master
you will do fine with a chev master cylinder