I have installed Wilwood dual piston D52 calipers on stock 1.25 rotors in front and 93 Camaro calipers with Impala rotors in the rear. I have a Wilwood proportioning valve but I really do not know what master cylinder to install. I'm leaning towards the 1 1/8 bore cylinder but I'm not sure. Anyone have a similar set-up that has experience with this set-up that can help?