Hi,
what is the brake configuration drum/Drum or Disc/Drum?
These are light cars - can easily use a manual setup.
If Disc/Drum i would change to a dual pot master cylinder for safety such as MC36440
https://www.amazon.com.au/Raybestos-.../dp/B000C71J92
That is what i did on my 65- I am quite happy with the braking . Slightly harder pedal .
cheers
Rob