if i was in this situation, i doubt i would swap in an RB30ET. i feel as if this is a down grade in engine. sure you get your torque and all the rest, but it just wouldnt sit right with me. the way i would go about it would probably be a 2.4L stroker kit and possibly a bolt on turbo, maybe a GT2530 or KKR 330?. (as well supporting mods) or even with out the stroker, go for something like the GT2510 or something small that will kick in pretty early in the rev range. give you some much needed low-mid range power/torque. the 2510 will make 200rwkw (more or less depending on variables) which the RB20 will make with stock injectors or at least 440cc/min.
just a final thought that i will probably get FLAMMED HARD CORE for this seeing that it is a toyota and this is a nissan forum, but ever thought of the 1JZ? very similar engine to the RB26. cheaper, no hassle of swaping the RB26 into RWD mode?
just some food for thought.
good luck with you decision
brendan
try http://www.skylinesaustralia.com/forums/in...howtopic=103095 for more ideas, with out stroking