I have a 72 BB that came with manual brakes. After much research I found that Corvette Central makes an entire original system including everything needed. Booster, new lines, brackets, everything, However not the first farkin set of directions.
I bought the system and after a few mis steps now have GREAT factory PB. Do it it's unquestionably (in my opinion) worth doing.
If I can offer help in any way pls hollar.
Ken