Heads and Cams for a Kenne Bell

FYI depending on the KB blower you choose you do not need to replace heads and cams.... forged internals however are a great idea!

The KB 2.8 will take advantage of big valve heads and cams at pretty much any boost level, it flows up to 1700 cfm.

Head and cams with a KB 2.6 will not give you any more hp at high boost levels (17 - 19 psi) because the limiting flow factor in the kb 2.6 is the upper intake (around 1150 CFM).
However, large cams and heads on a KB 2.6 will give you more hp at lower boost levels than stock heads and cams, untill you reach that 1150 cfm limit.

I would invest in forged internals before heads and cams. Above 540 hp, you are pushing your luck with a stock bottom end.

A KB 2.6 stage 2 at 10 psi will put out around 500 ish on 91 octane all day long. I've ran the hell out of my stock engine with that setup for 3 years.

Livernois has a good reputation for making good heads. I would give them a call and let them know what parts you are using and your goals, I am sure they will be able to answer your questions.

Wise choice, I went with the KB 2.6, and then built a forged 323, and now wish I had the KB 2.8 to realize the engines full potential.