You can move the springs far enough a 66-70 B body bolts right in. If you are worried about the slight perch difference? Move the rear shackle hangers. Pull the bumper with its supports. You can drill new holes in the frame rail and mount the shackle inward and forward if you like. Each drum will be 5/16" further toward the outside. Using a 727? A 727 driveshaft from a Duster fits perfect.
Doug

Last edited by dvw; 05/04/23 10:59 PM.