If you put together a DOHC EJ22E, assemble it as you would a 25D & use the 25D head bolts (22E bolts are too long), oil dipstick (25D dipstick has a higher mounting point), & black coolant pipe (22E pipe will NOT fit around the left DOHC head.)
Follow the factory service manual for the 25D to reassemble everything & make sure bolts & screws go back in their exact same spot. The end result will look just like a 25D.
If there are any questions, I'll answer them to the best I can. Btw, the final compression ratio I calculated with this particular engine was 8.8:1, which should be somewhat decent until I add a turbocharging kit. To anyone wondering if our pistons come up over the deck, yes, they do.