Too much horsepower?

With what you have for heads, I'd be very surprised to see that hit anything more than around 650, depending on the mid-lift figures. You need more duration to really let the heads work and get big numbers. You also really cant compare to Stock or Super Stock. They are an entirely different animal. Put it together and dyno it. Then worry if needed. I really dont think you'll need to sweat it much. (not meant as a cut, just going on info provided)