73 to 76 A body setup from spindle out.
If the 79 yorker is a C body with the 11.75" discs, then just use 73-76 dart spindles, and use everything else off the 79 yorker from dust shields out. Including caliper mounts, mount bolts, calipers, rotors. All this fits on the dart spindle which fits on the 66 charger upper and lower ball joints. You need the 79 yorker master cylinder too, as this has a bigger piston to port fluid to the bigger 2.75" caliper pistons off the 79 yorker.
This will add big brake discs to your charger.