Why would I do this? Well why does anyone swap 2.0 16V's into early Rabbits, H22's into Civics, or american V8s into, well, everything? More power of course... Also if it can be done... why not do it?
Also, I think it's only a matter of time until Nissan drops the VQ into the X. It doesn't make any sense to keep on selling the VG3.3 when 95% of all their other products, including Infinity, use the VQ engine at some state of tune. The VQ is more powerful and efficient at the same time. I think its a no brainer for Nissan. Maybe for 2004 or 5.

Thanks for the info on project X I'll try to look it up....

Another interesting question....

Does anyone know if the twin cam 4 valve heads from the 300zx fit the VG 3.3?

Thanks again,
Zpeed7