Need some help!

Really shouldn't. Unless you have some specific need, rebuilding the Kelsey Hayes calipers is a good option and far less expensive. Spend the money saved on good pads
Well... the thing is I really really want another bolt pattern, and if I am not mistaken, the HK is only in 5x4. And the rotors ain't that good anymore. Also I use my car as a daily driver with 2 young kids and they have to be save in the car too. But thanks for the suggestion.

I guess I have to go and find me some '73 disc brake spindles or '70 drum brake spindles. Any more parts needed?