Welcome.
The easiest way to get power out of the gze engine is to remove the supercharger and bolt on a turbo... A few of the guys in canberra have done this with great success. Turbo has it's own challenges... running on a stock gze ecu can be done, but I personally don't recommend it.
Also stop concentrating on how many killawasps your car has, worry about the power delivery and what it is like to drive. You want something responsive and fun, not something that makes its peak power at 6000rpm.
Have a look through some of the build threads to get ideas.