I did this conversion to a cefiro as couple of years ago.
it is worth while.
my r32 rb25de stock with 21/4 " exhaust made 115 rwkw this made the car very nice to drive .
my previous rb20 de in a skyline made 86rwkw for a comparison. so basically it makes the same power a a stock boost rb20det. we didn't develop the car any further but i feel there was another 10 to 15 rwkw in there with some tuning extractors and cam upgrade. motor dropped in fine no issues stock manual gear box was fine as well.
cheers
meggala