It most likely will not fit. Remember the GT-R is going to be an all wheel drive car. That means not only the engine and tranny but the floor pan and frame rails wll possibly need to be changed. Not that it cannot be done but if your are now contemplating changing the frame structure of the car, then your completely changing the drivability as well as balance of the car. I guess the easiest out be to but a wrecked GT-R (you know after the first week some idiot will total one) then take off the shell and reweld the G35 outer skin over it.

 

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I hope you have a lot of the above, but if you do, go for it!!!!