Disc brake conversion (70 Dart)

Mostly agree with hemi71x. The spindles will work for you, the UCA's won't, and I wouldn't waste my time with anything other than the spindles. Turn the calipers in as cores and buy some new rotors and bearings.

You can run pin type calipers on an A-body, it's not that big of a deal. You just have to use different hoses and plan the routing out that's all. It doesn't work well with stock parts, but there's plenty of hoses available to make it work.