Re: Compatible new master cylinder
I say just throw a parts store master cylinder on it and look around for what option works best for you. You have been given a few options, time , money, and skill will answer your dilemma. Good luck. Like Scot said calipers are dirt cheep. My cost on calipers is only $8.95 per side for rebuilt GM parts.
1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018