The crank won't hold together with that much power. They are good for up to about 350 hp reliably. If he wanted to build a more powerful engine and make it reliable then he should build a 3.4.

http://www.nissanperformancemag.com/february05/pathfinder/

I plan on doing one eventually. It just takes about 5 grand and some time. That engine is good for about 300/300 and should be very reliable.

Axle