Quite a design effort. Many dimensions must match between spindles, rotors, and calipers, both diameters and axial positioning. Much easier to buy a set from a company that already did so, and made the custom brackets needed. Scarebird is affordable. Wilwood, SSBC, and others are much more. You can also buy the 1973+ setup w/ all new parts on ebay but about the same price as Wilwood's kit.
If scavenging, the spindle is the critical part. You can use one from an Aspen/Volare or even B-body (see posts). You can buy a tapered sleeve to keep your UCA. The other parts can be bought new from rockauto, etc., just eat the core charge. Dust shields are rare, but not required.