Rear end advice?!!

The Abody 8 3/4 will be slightly narrower then the 7 1/4 which is a good thing. It was a direct swap into my 65 with the DS shortened 2 1/4 inches. You will need shock plates, 245/60/14 still fit with room to spare. As for the brake swap look for a 72 and up disc brake Abody which gives you BBP hubs . You can also opt for an aftermarket set up but most require 10 inch drum spindles. Most people go for the first option. search for a thread on here for the disc brake swap, lots of info,