most clips i have seen are low miles. i believe the way taxes are set up over there they encourage people to get newer cars so cars dont really rack up the miles.
i think the closed deck blocks were ej20g which are the older versions, 10 years old or more.
search around this site, tons of info on the jdm sti/wrx. they are all around 270+ hp unless they are wagons which are rated lower, 240 i think?