Re: 230K Engine swap?
320 motor can be built for performance N/A. Cams, higher compression, Headers(when done properly), tuned length intake manifolds,dual throttlebody,or even independant throttlebodies with the right lenght velocity stacks. That alone would get you past stock srt-6 levels... and make for a fun road car.
Remember this is a motor like any other and can be built for performance.