Don't buy the torsion keys, waste of money, you've already done what they will do. Cranking the torsion bars does not give you any extra travel that would require different shocks. The stock shocks top out about 1/2" from the mechanical limits of the suspension, adding a 1/2" thick nut or washer under the threads at the top of the shock is the ONLY thing needed with stock components to get the max allowable travel from the H3 up front.
Shackles are tricky, if they are 4" longer than stock you will get an effective 2" lift from them (the extra length is split because the front anchor point doesn't move and the axle sits about 1/2 way between the two points). Measure your height all around from center of wheel to bottom of the fender. If the front is at 23 1/2" and the back is at 24 1/2" then you need 1" lift (2" longer) shackles. There are a couple options, Warrior Products are beefy but the holes and bolts do not match the H3's bolts but they have several length and finish options, Supreme Suspension makes bent steel shackles like stock but 2" longer, and Schwarttzy makes a set too.
Before you get all crazy about being "level", remember that if the bottom of the vehicle is "level" then the roof will still have some forward rake to it. No need to thank me, just let your OCD run wild with that kernel of information. :mock: