66 cuda brake upgrade

I would, and did, get a new, not rebuilt master cylinder for a 67-69 Barracuda, 70-72 Duster or 67-72 Dart. This gives you a dual master cylinder. They are available in power or manual. Then upgrade your brake lines and add an adjustable proportioning valve to the rear brakes. Get lines for a Barracuda or Duster since they have the same wheel base.