dude have some common sense, you could spend endless amounts of dollars on a rebuild, its not gonna make it much, if any quicker.. your engine was probably fuct b4.
lighter car, lighter smaller engine... less pistons too turn over, less inertia...
consider this, they are the same ruff capacity (.2 woohoo) the bore and stroke of the FJ20 is going to be far closer to square, it can rev all day, it has a physically bigger turbo, and they are tuffaz nuts.
and thats comming from someone who owns an RB engine.
do yourself a favour either buy a bigger turbo and get a dyno tune, buy a turbo bluebird.. OR STFU!!!!!