I think that you are short selling yourself. The 73-76 K V8 K member is THE one to get. These disc brakes Are THE ones everyone wants for the easiest of factory disc brake swaps. The Upper conrol arms are necessary to use those spindle/knuckles. The factory sway bar with the mount tabs on the lower control arms..... Wow. THIS is the setup every Drum brake slant six A body guy needs to upgrade his car. I'm not trying to screw the buyer here by tossing out a highball price. The numbers add up to over $500 in parts.
73 V8 K member: $100-$150
Disc brake rotors,Calipers, Knuckles: $250
Disc UPPER control arms: $75-$100/Pair
Steering box, center link, tie rods $75-$100
Front sway bar with brackets, Lower control arms with tabs: $125.
Good luck.​