Glenn,
If you doing it just for the disc brakes, why bother? The majority of the braking is at the front on both cars. Many modern vehicles still use drum brakes. If you are going to do it then change the ratio of the rear diff and get more speed for your revs.
I'm changing my rear diff to get the benefits of a different ration. My drum brakes are well set up and in good condition, so changing to discs is an unwelcome hassle.
James
