B-Body Axle?

What car are you putting this in? Even the narrowest B-body rear is about 1-1/2" wider than a A-body rear if I remember right. And as Bruce pointed out the perches should be on 44" centers, not 43" like an A-body and I totally agree that it's not a good idea to spread springs to make them go in. You put the bushings in a bind when doing that and they won't last nearly as long as they should