SS Spring Shackle Question

It could be that SS springs are biased. The number of leaves as well as the arc may be different enough to cause that. Cars sometimes tend to sit "crooked" when on the ground. But as noted by rumblefish, get it on the ground and go from there. But I would keep the distance between spring mounting locations the same if you have to move anything to get the correct shackle angle. In other words, if needed, move both shackle mounts the same amount, but also double-checking that the original distance are the same from side-to-side.