Rb30's with AWD are supposedly very painful to fit in a R32 due to the extra deck height.
However you can get 3.4L out of a Rb26 block....
Hmm, indeed i never realised how cheap they are, 3000 bucks. pistons and Rods are going to be a few thousand anyway so any rebuild with that kit is only costing 1-2K more, very tempting