my mate and i have just finished a conversion in his vl. its an rb25 with a gt35r/1.06 rear.
the engine is standard except for tomei poncams,splitfire coils,xf throttle and fuel and computer obviously.
it is running through a vl turbo 5 spd.also a 3:45 diff ratio
the engine makes 20 psi by 4200rpm and is producing 313rwkw.
personally i would recommend the .84 rear housing and a 4:11 diff