If the car is the height you want it? then you have a couple of option, either get another shock (with a longer stroke) or measure the length of the body of the shock itself, then measure the open length of the piston (shock shaft) if they are about the same the shock is too short, but if they are different then they may have stroke limiters in them, this is done to stop the spring from becoming unloaded over bumps and falling out, or another option is take the shocks back to where you got them and see if they can help you!
But there is another option too, you can get springs reseated so send your springs back and they can reset the ride height to what you want. I am pretty sure Kings can do this for you!