on the HDK, simple change out the rack and spacers. Because of the difference in the mount (front to back placement), to place a power rack where a manual rack was previously used and keep the same location, remove 1" off the spacer....or get a new 1" spacer.
the power rack is also slightly larger in diameter at the center (under the oil pan / front of the sump) than a manual rack.....the HDK allows clearance for both