[Bryan59EC]

I am using 72 Chevelle discs/rotors/spindles/booster

67 Disc brake master cylinder

67 brake line set

All on a 66 Elky

Virtually everything is available from the auto parts stores

You will need to acquire a set of spindles for a disc brake car, along with the caliper mounts.

If creative, the spindles from drum car can be used with some grinding/cutting on the upper shield/caliper bracket mounting boss.
Your current steering knuckles can be reused.

Spindles and caliper mounts and shields are now being reproduced, but I do not know what kind of quality they are.

On my 59, I bought a kit----had trouble aligning the car when done
(2" drop spindles), and the tiny booster does not provide enough assist.
I have to use a 7" booster for valve cover and clutch master clearance