I assume you're talking about this one?
If so, you probably won't need shocks to run it, per se.
What I mean is that shocks don't care whether or not they have 1/2 of the downtravel available or 1/4, they just compress and rebound throughout their travel.
THAT SAID.... you'd probably need new shocks eventually to make the "kit" work to the fullest extent. Forget what you think about the shocks that you currently have. The red shocks you have now are sized appropriately for the coils that you have now. To properly size shocks for your application, you have to install tires, coils, cycle the suspension to max, size up bumpstops, then order shocks that will be short enough to not bottom out before you hit full bump. So for me or anyone else to say "you need XX length to work" would be guessing.
You'll be adding a shitload of weight to the front of the Jeep compared to how it is right now, so you might not end up with that much lift (1.5") or getting rid of the rake. Nice thing about the EVO setup is that they supply the rear spacers, so if you end up nose high, you can add them in, or if the coils settle under the weight of the bumper and everything, you can leave them out.
The addition of spacers in the front probably won't be that noticeable comfort-wise. It might be a change in steering dynamic due to the increased castor but that's a whole other ball game. The stock coils won't like the weight though, so they will probably settle. I'd yank them out and sell them on Craigslist or something before they settled...cause the HD JKU springs can give someone with a bone stock 2 door a bump in height.
Would you be okay with just the EVO kit? More than likely. You won't get the absolute most out of the setup, though, cause the shocks will be slightly too short (again, this is a "probably" kinda answer). Only way to truly know is to buy it and find out.
And I'd skip those "rock rails" if you're putting them under the stock factory rails. They just add weight and kill clearance. The stock ones are adequate for mild to moderate wheeling.