The 2.76 will really spin that blower! It'll give you about 15lbs of boost initially, but that will taper off in the upper RPM's thanks to the Eaton's lack of efficiency. Getting a bigger HE (Heat Exchanger) will help cool it off when you are not in boost, but does nothing for power and won't reduce the heat soak while your foot is still in it. If you plan on porting the supercharger than go ahead and get the 2.76 now, but if not then stick with a 2.93.
U.M.