another stupid drop question

[corn]

I am doing a 5/7 on my GMC & am gonna be using a flip kit on the rear. My question is what is the best way to do the other 2"? Front shackle perch relocate & rear shackle or a 2" block.

I told myself when I started this project that I'd make as many of the parts myself as I could. If I modify my rear shackles, do I just add 1" of metal to the shackle to = 1" of drop or if Im gonna go through the work, go ahead & just drop the other 2" in the shackle & then what happens to the pinion angle?

OK, I'm done with the dumb questions now, well at least until the next one...corn