1970 slant six Duster currently 9" drums with 14" wheels. What year and model can i find some front disc to swap over to without having to change a lot? Would like to keep lower upper arms and ball joints, spindle??
If your ball joints and UCA bushings are good, best to stay with your existing spindle and UCA and use the low-cost Scarebird kit. If you change to 73+, you need new wheels and will have to carry 2 spare tires, unless you also change the whole rear-end. If you want high-end aluminum calipers, I vaguely recall that Wilwood or such has a kit for 9" drum spindles, but >$700.