my ss springs make my car lean the wrong way left side higher than right

ok so i know why it is doing it, the guy before me move the springs in and when he welded the spring mounts on the rearend he just set the rearend on the spring mounts and left it hanging in the air :angry7: now if he had done this with good stock spring it probley would have been fine but my ss spring are arched different and reley on the rearend mount to be the same left to right so it can put a preload on the axle to make the car lift the right side, with the mounts not the same i have no twist and makes my springs usless, i know i will have to grind the mounts off but what is the best way to get the back to stock location any help would be awsome
thanks kyle