Power assist brakes

How much of a hassle, would it be, to convert my manual brakes to power assist?
Would it be worth it?
What parts would I need?
Would I need a new peddle?
Oh. I forgot. It's for a 72 Swinger
Thanks

Not much hassle; almost zero
Absolutely worth it, when set up right
You would need the booster and its adjustable pushrod
same pedal
Disc brakes on the 70?