67-72 brake linkage in 60-66?

[vortech71chevy]

Hey guys, just replaced all my components in my brake system and converted to power brakes and front disk, ran new lines, replaced all drum components etc. I used 71-72 components in the swap. The feel of the pedal and the stopping ability is definately not where I want it to be... I have bled it and bled it and bled it... I have drilled the brake pedal 1" down for the linkage and it still doesn't stop anywhere as good as my 71 shortbed did (to be fair the brakes on that truck worked better than most stock systems). Which had me thinking about the possible differences... I then remembered that my 71 used a compound linkage system that reduced brake pedal travel and effort and maximized travel to the master cylinder. This gave the feel in that car of a pedal feel that rivaled a modern car. Can the compound linkage be adapted to the 60-66 models? I no longer have the 71 for reference and I'd like to hear if anybody has used it/tried it before I start throwing money back at it...

Secondly, my brake issue is not getting better with any amount of bleeding but still made me think there is air in the lines. As I depress the pedal, there is significant take-up on the pedal with no braking response at all. There is then a sudden surge of brake pressure and the car stops too abruptly. Any thoughts?

Thanks in advance for all the help. I've finally got my lab to swb conversion finished, t56 in place and brake/suspension stuff done, I'm gettin antsy to get her buttoned up and go cruising!