8 lug disc brake kit?

[Mayo]

I need to redo the brakes on my 68 C20 so I figure I might as well upgrade to discs. I was thinking about swapping out from a 72 C20, but I figured all I would really use from that would be the spindles. I figure you might as well get new rotors, calipers, tie rods, and everything else seeing as they will also wear out eventually and came across these to kits. Which one would you go with? Also, when I swap to discs, to I need to change out the brake booster and master cylinder? Thanks.

http://www.brotherstrucks.com/prodin...number=DBC8L20

http://www.performanceonline.com/63-...-deluxe-8-lug/