Okay, here's the issue with fitting a VQ in a Sentra: First of all, that engine is HUGE. There's a lot of junk that has to fit in there. Second, you have to custom fabricate motor mounts to hold the engine, as well as half-shafts to work with the Sentra frame. Third, the VQ weighs a lot more than a GA or SR motor. This will hurt handling. Your weight distribution will be way off the 50/50 mark. If you add weight to the back, you may get more toward 50/50, but you now have a 3000lb Sentra, which is more than 300lbs more than the suspention was ever designed to handle. So, custom fabricate a suspension that can handle the increased torque and weight of the car. Next, get an ECU that can handle the VQ engine in a Sentra. Since it's never been done, it's going to take a ton of money to have one created that won't throw a CEL, and you'd be lucky to have everything work right. Next, come up with a way for it to pass emissions. Slip the guy $50 every two years and pray you don't ever have to pop your hood.
So, what are your results? A poor handling, somewhat quick, ultra-expensive Sentra that is totally illegal in every jurisdiction. I think I'll stick to the proven, good-handling, fast SR20DE-T swap as my favorite.