Change shocks also?

If I put on 2" lowering leaf springs, will I have to change shocks? What if I add a 1" lowering block to that?

Lowering it that much will probably create the need to drop down a shock size or two from where you currently are. The best thing to do is get the car sitting like you want it to and then measure from C-C on the shock mounts. Grab that number and we can help you select the correct shock for what you've got.

I would also add, only use lowering blocks as a last resort.

a 2" Drop Spring AND a 1" Drop Block will necessitate a different Shock/Damper

Anu update, OP? What shocks did you get?