Disc brake conversion (70 Dart)

So it sounds like the basic paths are:

1) Rebuild with the parts I have (namely the spindles, using the rest as cores or throwaways) and then ordering new rotors/pads/bearings/tapered ball joint adapaters to match. Possible downside being using old tech for braking.

2) Ditch everything and order a kit from Wilwood (or similar manufacturer). Theoretical upside being everything is new and made with new tech. Downside is cost, debate over performance improvement, and may require getting new wheels/tires because the ones I have (both on the car now and the wider rims I have as well) won't fit.