Drop Spindle Question !!!

[Chevyrod]

I installed my air ride suspention and I need about three more inches of drop in the front to level the blazer out. I only have bags in the front now and I want to order a set of drop spindles. I have 15" wheels right now and was wondering what kind of clearence problems I will run into with the lower control arms etc. Will I have any problems with a 3" drop spindle or should I use a 2". If I do have a problem with the lower arm how much does it rub and can I grind a little on the lcm to make it work. I really don't want to buy new rims right now and I know you guys have ran into this before. I just need a little help before I order a Set. Here are a few photos that show what I am trying to do.