Just did a 68 RT clone. Call the Ram Man for his booster and Master Cylinder. Make sure you get the combination valve for the drum disc hold off valve. The 70 brake line set up works fine but you need to plug a port and the pro valve. Make sure its tight and use tape.

The neat trick now is to use the sp[indle sleeve that Ram Man sells so you can use the 73 up Rotor. Otherwise the small bearing 70-72 2 pieve rotors are now costly and not as good as unicast.

The pedal feel is awesome!