I don't think that there is a perfect street / package. If you build it for double duty chances are that your going to what big power for the track which in turn will make your car less street friendly. I don't know about your area but were I live there's no place to go racing anyway. It's hard to have your cake and eat it too. Myself, I'd probably build a engine that has great throttle response, good low to midrange torque.