Sorry for the late reply, my setup is PDB and I just noticed that yours is manual. Mine works fine, but not really sure how it would work in a MDB setup.
Any info or pics of how you adapted the 04 mach1 master cylinder/hydroboost
to the car. Changes to the brake pedal? Bracket to mount it to the car? What PS pump did you use? How about how you adapted the hoses?
If your looking for a intregal power steering box, Borgeson offers a kit.
https://www.borgeson.com/catalog2/index.php?cPath=164_190&osCsid=89ed977b7e26beb473e2dd1680fd32c4