'75 Duster B body front brake upgrade impressions wanted

That's kind of my point. Once the brakes are locked up, they're not braking......the tires are. Getting a good balance between front and rear is the best you can do in a non-ABS vehicle. Changing the modulation, pedal effort, brake fade, etc. can help in overall performance, but, IMO won't change your stopping distance if you can lock up the brakes, both front and rear.