dont kill yourself searching for answers. if you cant find something, dont hesitate to start a thread and ask. there is ALOT of information to scan thru, even using the search button, some people are just too anal to realize that.
welcome to the board
the main thing you should know, is that an engine is an engine is an engine. theres VERY few "240sx" specific things. learn about motors in general, and turbocharging NA's in general, and you'll get a great idea of how to approach mods, and carry them out properly.. on 240sx's and other cars as well.