glad you are using my site.
the brake and suspension did evolve quite a bit, but i ended up in the rear with the following:
1967 wide 5 drums
1967 shoes
1967 hardware / wheel cylinder
stock 4 lug backing plate
stock 4 lug IRS bearings (1974 i think)
stock axle stub
cut 12mm off 4 lug drum at the nipple end to make a spacer (which you probably saw in my pictures). Many folks just use T3 drums and backing plates, or Thing drums, but they add track. with my wheel/body combo - i wanted to reduce track.
That is the brakes.
but i did change the rear trailing arms a lot too. starting with stock trailing arms, i narrowed them 1.3" on either side at the bearing housing. this required new narrowed axles. Type 3 IRS automatic's had one side that was narrower than the other due to an offset transaxle in the automatics. i bought two of the short ones. They fit fine (actually i made the trailing arms to fit the axles)
hope that helps.