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If it were me, I would just go to AutoZone/O'Reilly/Adavance/etc. You don't have 4-wheel non-power drums on a '75, do you? Regardless, you can get the master cylinder & brake booster at a parts store. Brake lines are available from fine lines & at least one other company. Misc. parts I would look for in salvage yards (not sure what those are).
Your best bet is to find a late B with P/S in a junk yard. You will need a pump with mounting bracket and lines, the booster, booster mounting plate, Z bar linkage, gearbox, and steering shaft ( rag joint to gear box ). You might need the pedal and arm also. Just too much to try a piece together IMO. Find a donor and get it all.