Question: Best v6 engine combo?

[q's]

Hi all.
Im entering a motor racing class whereby you must run stock(ish) engines in which the v6 is already popular. We have to run a 2 barrel carb also - so need to modify the inlet manifold to suit.

Im wondering if anyone can shed any light on the best combination for building the most output from a holden v6 engine.

What are the best flowing heads? Inlet/exhaust manifold? short block etc.. what cam has been used for these sort of applications?

Im new to the sport and wanting to ensure Im on the pace at the outset - so wanting to build the most horsepower possible within the limits.

Engine must be naturally aspirated (no turbos or superchargers).

Id really appreciate anyones help on this

[greenfoam]

Are you allowed to modify the heads and run any cam you want? or must everything be stock?

[immortality]

isn't it goingto be a pain in the *ss to convert a holden V6 to a carbie.