FEW ???'s for the Air Bag Guru's

[TOYOTA61384]

I have I 72 gmc Sub that I am going to start bagging here in the next few weeks, and had a few questions. First I am going to start with the rear, and was wondering if I go with 2" lowering blocks, and a 10" step notch (I have tall tires on my 20"s) can I use the factory location of the spring, with a firestone 2600 bag and get the rear bumper close to the ground? Or will I have to include the upper mount in the notch aswell and raise it too?

Second, for the front I am probably going to do it in stages, so first, with the kit from ***************** and a 2500 bag how low will I go, second will a 2600 bag fit in there with that kit?

Third, and final (for now ) I"ve been reading all the crossmember drop threads etc, and there is one thing I haven't seen done? What about on the lower arm, drilling a hole in the crossmember and reinforcing it, then mounting your control arm cross shaft through the crossmenber and flipping those lower u-bolts, raise your upper arm, etc. Has anybody done this, or thought about it? Or did that even make sense? It's to early

Thanks Alot

Robert