first off, yess there is a SR20DE AWD bluebird available, not sure how easy one of these would be to find over here but is doable.... you would have better luck getting a turbo U13.
second i have seen the gtir engine in one of these, i am guessing you have an idea of the differences between the U13 and N14 SR20DETs, so having said that, it is a straight forward change (no need to change mounts or anything) but where all the intake pipes are, are completely different, so that'd be the first thing to tackle, the looms are also different so you would have to be doing some electrical work aswell. there would be a few other things i am quite sure but since i havent done this transplant i dont know for sure what they are yet.
as for the gearbox, they are pretty much the same so no changes there.
my advice would be to save the cash on the transplant and get the turbo model and work that one. will save you cash later on