As far as I can tell you are putting 73 discs on a 67 k-frame? The weak link in a 67 k-frame is the idler arm. It is 67 only and has an inferior mount on the frame while the 68-up has the idler arm sandwiched between two mounts. Everything should work just fine though as long as you use the upper control arms from the 73 with the bigger ball joints.