Thanks for your advice! I am thinking of the motor and ecu, and whatever absolutely needed. I am thinking of keeping the Si tranny. I heard Si's tranny is pretty ok with vtec. Do you have any info on what are the things that I absolutely needed to change along with the motor? I want the benefit of the motor but if I can save some money I would do so. But there seems to be packaged "changeover" online so I don't mind changing things like throttle body as well (since my old one MIGHT be faulty in the first place, or maybe the car is fine and only the engine is acting up). I have a friend who had worked on Honda for years and I am going to ask him for help. But I would want as much info as possible before starting out!

I am looking at the changeover package from sofast.com.

http://sohfast.com/store/used/prelude.asp

Thanks!