Edelbrock makes a good power package that includes rpm heads, rpm intake, and cam. They claim it makes 367 hp, which is fairly decent without a power adder.
You can check out the dyno sheet at
http://www.edelbrock.com/automotive/index.html Look under the "Dyno Test Results" section on the left side of the screen.
It's hard to beat Edelbrock's consistent quality. I have a set of rpm heads and couple of their 4bbl intakes, and I'm satisfied with all.