Current shock wont work cause you're going to be stratching them out. I think the shocks that come standard with those kits are junk. I didnt even use them with mine.
The leveling kit is basically new keys and if you want to spend the money you can get new rear blocks. (just remember installing them that the thinner side goes towards the front.
Get the tool for the keys. Unless you modify a c-clamp. You need to release the pressure when you remove them, and mark or count the threads when reinstalling.
Or just crank on the torsion bars ...