I am in the midst of converting my YJ to hydroboost. Got the complete hydroboost, master cylinder, prop valve, brake pedal assembly, p/s pump and lines from a 2008 Silverado 6.0 for $56. I will snap some pics as to how it goes.
I know this is a far reach from upgrading wheel cylinders, but mine started with upgrading the stock prop valve for the 8.8 with discs.......
I'll be waiting for your write up with pics!