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This is from memory, when I put the disc brakes and power booster on my 55 bird in early 1999. I bought the disc/power conversion from someone in the mid west. They retired and another (possibly Hill's) bought them.
The disc dual master mounted as most conversions do. The booster mounted to the fender as you say. It only powered the front disc. I do not remember it having either a combination valve or a rear brake proportioning valve. I don't remember if it had different rear wheel cylinders, but I know some kits do. It's to match the rear braking to the front.
It all worked quite well, but keeping the rear brakes adjusted was mandatory. Know then what I know now I would have fitted the rear brake self adjusting parts to the rears, maybe added a rear proportioning valve and left well enough alone.
If you need more info about the front calipers and rotor, rear shoes, etc. ask. I'll tell you what I remember.