Are you full licensed? If so then i would recommend a nice GT3076R to cure the power needs.

But if you plan on staying N/A, Jun, Spoon & Toda offer some great camshafts for the B series. Depening on how big of a camshaft you go, you may need to upgrade throttle body diameter and look into port work on the cylinder head.

If you are in Melbourne, feel free to give me a call to discuss further