doable? yes! waste of time? absolutely! expensive? highly!... Its not feasible as the attesa system is complex and would need a heavily modified sump at the very least to even try and get it to work, The pick up in the sump would also have to modified as well as alot of engineering to get it aligned etc etc etc. You would need at least 10k just on organising that before you could start modifying the motor directly. Its heavier and is of no gain what so ever in a GTR platform over the 26 or even 30/26. Its also a bit longer and taller which aren't huge issues.
if you want displacement get a rb30 for $100 buck and spend 10k forging the bottom end/balancing the crank and sticking a 25 or 26 head on with a big single will make 1000hp+ all day every day
yeah no issues in a rwd just like any other swap, would require cable mod or wiring to electronic throttle, but far easier for a gts but then again a 30 block will make power as easy and bolts up no issues