1972 Scamp disc brakes

Leave the upper and lower control arms in their respective cars. everything else in between needs to be swapped. On the hydrolics, I would swap everything from the proportioning valve to the master cylinder inclusive. If either system is boosted and you want to change from one to the other, you'll need all that too. If you choose to keep it the way it is (manual or boosted), get a new master cylinder for the system you choose to keep. I wouldn't swap just the master cylinder between boosted and manual unless you just want to see what it feels like. The piston diameters are different and sometimes the pedal effort needed is too great or too touchy.