Lowering springs and tire geometry

[thepunisher]

At first I wasn't going to lower my truck, now I am thinking I would like to lower it two inches in the front and four inches in the back. I have leaf springs so I would use lowering shackles for the rear. My question is if I use just lowering springs in the front does that interfere with the tire geometry if all the other components are left stock? Or are the drop spindles really the way to lower the truck to maintain proper tire alignment.