Thanks for the info.They get pretty good power with turbo on them, if you want to stick with the KA24E. You'll find some good info at this site: KA-T.org - The Home of 1000+ whp/7 sec Turbo KA's
Another way to go is swap to an SR20 engine, of which there are several variations: I've seen streetable SR20DET engines pushing 400+ HP. Lots of info on building them up on the web!