The only swap that is considered worth it is the 2.4 swap from a sebring i believe. Doing a 4g63 or srt4 is just not worth the time or effort to do it proper. It has been done, but usually it is way to much hassle for what you get out of it. you will have to rewire and make mounts for the tranny/engine and do a ton of custom fab for anything other then the 2.4 and it is to much work for what you get. you can easily build the 420a the handle some boost if your set on keeping your car and want more power for wayy less money and headaches then a swap.