The major issue is the spindles on the 73 are 3/8" taller than the spindle on the 67 but there are many ,many people running that taller spindle without issue. You can just pop the 2 ball joints loose of the 73 B and swap it right over to your 67 . use the lower ball joint from the 73. The calipers on the 73 are probably mounted to the front , if so and you have a stock front swaybar , or there is one in the future , you'll need to swap the spindles side to side to mount them to the rear and get the appropriate rubber brake line to make it work.
The distributions block on the 67 is just that a distribution block so you'll need a proportioning valve to make it work properly and obviously change the master cylinder over.
Are you going manual disc or power ?
