like igno said, what u effectively need, is a complete gtr so u can take everything off it, and swap it into the 350z. it's impossible to say if/how the 4wd system is going to work without dummy fitting stuff up and checking for clearances/how it lines up.
basically what u'd need, is from the gearbox forwards (including the front driveshaft) and a custom tailshaft. then modify the tunnel to suit the box, fab some engine mounts to get the right angle for the front axles, and mold the front hubs/suspension to the 350z.
be prepared to waste alot of sh!t in the process, as alot of ur stuff will be custom made, and when it comes to custom made things, many attempts are usually made to get the final product.