updated with more pics, it should all be done tomorrow. A few tech notes: your fuel lines will ned to be re-routed, at least on a '70, since on the driver's side there was some interference with the coilover. And if you have Baer rear discs, no matter what the orientation you put them in, your parking/emergency brake won't fit . . . looks like I'll be carrying around parking chocks/blocks-'o''-wood when I park on a hill. I have been thinking about alternate emergency brakes, anyone have any ideas? I am willing to go with a different set of rear brakes . . . but not back to drum. (aesthetics, mostly)
you should look at one of the internal drum rear disc setups, like the explorer or crown vic style. SSBC makes one and there is another that might work real well for you, www.vintagevenom.com check out the standard rear disc kit
edit: you could also look at using a pinion mounted e-brake too.