I have a 2007 GS350 with Tanabe NF210 springs and staggered 20" wheels.
I need to correct the alignment issues.
What do I need to purchase?
I have no rubbing currently, will I create rubbing by correcting alignment?
If I put a level vertically on the wheel, the rear needs to come out nearly 3/4", I understand they are supposed to have some negative camber, how much I don't know.

Also, it seams like I have no rear traction, I assume that is due to the camber issues

 

you need alignment for anything to do with suspension
If you using spring and not coilover then you need camper kits for rear.