When I converted to rear disks all I did was a little forming on the existing brake lines to fit them to the disks, worked fine. Granted they were lines that I made when I installed the B-body 8 3/4, but they used the same routing and length as factory. If they’d been original lines they probably couldn’t have handled the re-forming without kinking, but the new lines had no issues at all and the re-forming was pretty minor in my case.
I still prefer the tapered bearings. I’m not gonna argue the second generation green bearings don’t work, they work just fine. But I’d rather have the tapered bearings and heavy duty adjuster that DoctorDiff makes.
My DoctorDiff rear disk conversion install can be seen here
My "new" '74 Duster- or why I need a project like a hole in the head