The brakes on my 76 are pretty much as you described. @BarneyT and I upgraded to the SS brake lines, new master, new booster, now rotors, new pads. @zinz and I replaced the rears a few years ago and have adjusted them a few times since. Barney and I bled the brakes 4-6 times. I’ve lost count…. Braking is better but nowhere what I feel it should be.