If you can get the box and motor out yourself go see Murnane Motors on the coast they charge $5000 to sit a RB26 between the strut towers and weld up the front diff for RWD and make a dump pipe - in a R32 GTST.
Dont expect anything to be hooked up you are expected to either pay them more money or take it somewhere else if you want the car running...
If that does not sound enticing go see Mick @ Signature or wait till Dan (Elite Racing) slows down a bit, I believe he is into that sort of thing...
Few options there for you, Every performance workshop can do the simple RB Engine conversions
Just be careful because service/price/customer satisfaction differs greatly depending where you go