I don't recommend you professionally restore a 220D. If you did you'd
start out by giving somebody 15K and can expect to do that another 4 or
5 times. When complete, everything is as good as it was and probably better
than when it left the factory. Each sticker, wire and nut is correct.

If you just want to get your old 22D nice again that's a lot easier.
I take it you're not doing the work yourself. So first step have the brake
hydraulics replaced. They're 35 years old and deserve to die if they aren't
dead already. Change the soft lines for new hoses (they're date coded),
replace the M/C and booster. Do the pads and rotors. If you want to spring
for them get rebuild calipers from White Post.

Now go find the Ponton folks and get somebody to cough up a new brake
pedal rubber pad, that's your badge and it will redmind you every time
you use yoru new brakes. Get this done and we go from here, jah?