Disc Brake donor vs Disc Brake kit....

I bought a front disc kit from wilwood for my 63 dart, the kit works with all of the stock components and also has 5x4 1/2 bolt pattern on the hub. I have been running it for a little over a year now with no issues. It is a little pricey though. Also running 15" wheels. If I did it again I would have upgraded the rotors and calipers but, that's even more $$$$