Re: doing rear disc on a 60\'s chevelle rear end.
home brew would be easy, take caliper brackets from something like a dana 44 front axle 10 series and use caddy rear, or s-10 or dana 44 calipers and do what you gotta to get them positioned right and attached and then run hoses and lines after drilling required holes in flange of axle tubes and such, use rotors for a slip on over hub style rotor application
can be and is done by ppl, more than possible to do, can do this to most any RWD rear axle
good luck