to be honest i wouldnt even bother doing rings and bearings if the rb30 you have is a good condition running engine.
for example.. my rb26/30 is stock as a rock only things i have done is oil restrictors, shimmed up oil pump and rb25 sump. MLS headgasket and ARP studs hold it all together.
i make 395 rwkw and the car is a drift car and has been going for ages like that. running e85 and 35R turbo.