you'd get more gains doing this all to an rb30.
add
- n1 or similar oil pump.
- cams
- check the head for any damage (cracks, lifters, valves, springs)
theres a shitload of things you can do.. just go to your workshop and say.... "i'll have 1 of each (2 where applicable)"
give us a price range and we'd be able to tell you more accuratly.