If your going to go to all the trouble of swaping engines, why not install a VH45DE? If you use the VH45DE bellhousing it well bolt right up to the VG30DETT transmission. Now you have a engine 100lbs lighter, more HP and touque and it's NA. If you want to see what it can do go here.
http://www.nissanperformancemag.com/...nitiengine.php