You can fine tune the fore-aft placement on any rear end you use via the lowering block. If you don't want or need a lowering block, use a lets say 1" thick block, same width as springs and about 5-6" long. Get a used round head spring bolt and weld it to this 'block'so that just the head sticks out and is centered. On the flip side drill a row holes same size as round head, maybe 3/4" appart (These dimentions you can adjust as needed) first hole directly under the bolt. Then add holes away from center towards one end. Lowering blocks are inexpensive but can also be made very easily with rectangular tubing.
Now you have a method of adjusting the placement of the rear end via this little block. This item may be available through various hot rod/chassis vendors.
