Is this about as fast a Kingcat will go ?
It may go much faster.. the speed of the airplane not depends only on what engine you straped on it, but also in how much time you allow it accelerate at full throttle, not loosing it´s kinetic energy on turns.
Also flying at a club well over sea level makes noticeable differences..
However I don´t recommend you try to find it unless you have plenty on confidence on your general setup, and a spare jet model!
Enrique