RE: internals?
 

Stock sleeves will hold you to 500-550whp on a D16. Sleeves will hold more power than you can make (500 is the highest I've seen).

Most importantly research. The more you know the better.

RE: internals?
 

Unless you want the bottom of your motor to look like mine (see pic below) I suggest you do lots of research, specifically about how to fix your oil pump so that it doesn't starve the bottom end of oil ;)

http://i12.photobucket.com/albums/a2.../Blowny811.jpg