Power assist brakes

Have an Alterkation front end with disk brakes. New drums in the rear. Engine is a 572 (440) dual quads, making 700+ HP at the crank.
Just drove the rig a few time, so the front pads are probably still beding in. Haven't really ran it up to highway speed and tried to brake hard.
Noticed Mancini had some kits.
Just starting to research and see if I want to change.

What do you have for "actual brakes?" That is, what are they, how big? It might be, that if you have the wrong combo of MC size to wheel cylinder / caliper piston size, you are fighting UNneeded pedal pressure, and if you are running small disks / drums, you won't generate the braking you need.

My "backyard case:"


I'm an old guy, severe arthritis, have lost a LOT of poop in my legs. I cannot stand long periods or walk very far.

67 Dart, SB, 73 /4 A body discs up front, stock master (drum master) and Linc Versailles disc at rear. I lucked out. I can lock the tires at freeway speeds with "some pressure." I don't have to work all that hard to do so.