Wow - an EJ22/25 never looked so nice in its life!!!
nxwrxfx - I don't want to answer for F4tune, but he's doing something a little different than what you want to do. He's got a normally aspirated EJ22 (think: about 140hp on a good day) and is mating it up to an EJ25 block (but again, a normally aspirated block, not an EJ25 out of an STi or anything.)
Basically, it's a poor mans, simple upgrade for us 1993-2001 N/A folk with dead or blown engines looking for a little boost in power and the chance to get a cleaned up engine under the hood. He won't need to tune it as the stock ECU will handle everything just fine with >91 octane.