The axle rolls 1 1/2 degree for every inch of lift, so 2" =3Degrees.
You would want to roll the spring mounts back, the diff foreward in relation and then the swivels back.
Eg 4 inch lift, leaving the radius arm mounts alone, you would mave the springs back 6 degrees, the diff forewards 6 degrees to balance the UJ angles then the swivels housings back by 12 degrees, 6 from the lift and 6 from spinning the diff.