Those 6 piston Z06 calipers have an awful lot of piston sweep area to move with stock manual brakes. You may have to use a 7/8" or 15/16" master cyl. in order to be able to lock them up but your pedal travel is going to be excessive. I think you`re on the right track with the hydraboost. You`ll get better performance without having to get that "Legs Of Steel" excercise video.
Mark SC&C