jpa,

I recommend that you re-prioritize. Your valves will flow much better with rockers and a Roe. A 6.5lb Roe will really respond to the rockers. Are you also running smooth tubes and high flow filters?

Now I could tell you that headers would be a waste of money, that they would give you a tiny increase in HP for big money and that they will more the double your noise (especially with the blower.) But that would really piss off alot of people.....end up with headers, if you need to...start with rockers

Are you going to run wide bands?