It would be easier to swap engines. Seriously. Fuel injectors, all the manifolds, and super charger. By the time you buy those your more then half way to a used engine. As others said radiator, possible hood interference. Probably other parts we haven't mentioned as well. Fuel tuning is a big one no body offers provisions to tune the fuel system to properly adjust the air fuel ratio to the new amount of air. All said and done you finish all the head aches you have only slightly more power 20ish Hp and you have to buy premium fuel at the pump. Hardly worth the effort imo. A set of cams, headers, will get you near the same power NA. Without half the effort. The factory supercharger is very undersized puts out minimal boost 2-3psi. A few guys have went turbo as its more advantageous. But, neither guy seemed to have it tuned correctly. If your serious about engine mods. Take to the z31 forums. The VG33 is a ultra common swap into the older 300zx's. They know way more about building engines then us here.
Ben