Can I get the 2 for 1 special please??

I want to have rear disc brakes to compliment the front powers that will eventually go in as soon as we find a donor car. But I also need a new bigger rearend. I wanted to know if I could possibly kill two birds with one stone and pick up a 9 inch rear with disk brakes still on the car. If, which car has a compatible rear end for the 65 and had factory discs? Is this possible? I just don't want to spend 1K on rear disc. Thanks :D
 
the only factory 9" that came up with disc brakes was the lincoln versailles. they are getting harder to find, i have one for sale but i thaink it's already spoken for, pm me and i'll let you know what happens