In all honesty bro, if you are dissatisfied with your n/a VG, then get a usdm or jdm vg30dett and throw that in their... The rb is a great motor, but so is the vg. Both have very stong designs, and can both take substantial boost.
The vgdett would be a straight foreward swap, and for the money you would spend on trying to make it fit, custom parts and labor, i mean as it is, the vg30 is already compacted into that engine bay. And with the money that you saved on the swap, you could do some mods to the vg. Just an opinion..
More power to ya brother if you do the rb swap, good luck and hope all goes well.
-Alex B.
