In case anyone is in a similar situation as I was...
I put a camaro rear into my truck and was looking to use the 2.5" width camaro leafs as well. Problem was in finding some mounts to bolt the springs to the frame. I thought that unversal leaf spring mounts would be something of a common part, but they actually were difficult to find. Ended up finding with and buying them from a company Warrior who makes offroading parts. Drilled the frame and they bolted in great for mounting the leafs themselves but were not wide enough to account for the massively wide camaro stock bushings. So next step was to turn some new urythane bushing to fit.