Looks like Greddy already swapped the EJ in: http://www.86forums.com.au/index.php?/topic/210-greddys-600hp-cosworth-ej25-fr-s-86brz-lots-of-engine-bay-pics/
I'm with porcupine, make sure it is the valvecover that is leaking. What kind of mileage is on the vehicle? Any service records with major repairs?
Have a great day!