Scored some McGaughys drop spindles/springs, now what?

[ElkyRacer]

I just scored a set of drop spindles/springs from a 67-71(not sure on the year, saw the truck but never asked for sure) truck for a bill! 2.5 and 2in springs. Now Im rounding up everything else Ill need to install. I got the part # for the balljoints/tre as he even had his old boxes from the install. Im going to have to go with disc brakes for the spindles tho. Who would you guys suggest getting a kit from? Who uses stock components so I wont have to order expensive pads/rotors/calipers when time for replacing? When dropping the rear 5in or so is an adjustable track bar needed? Who has the least expensive rear springs/notch? Or should I just make my own c-notch? Anything else Im missing? Now to find some stock steelies and make some white walls!!

Thanks.
Kyle