Yet another header question

Fishy68-It will be dyno'd at some point not sure exactly when. I am having it all put together at a local race engine builder it is kind of on the back burner there as it is some what of a small fry there compared to what he usually builds which is ok with me cause im not in a hurry for it, still trying to get the body ready for the engine! I will be sure to post the numbers when I find out but surely it will make 475 at least I am really hoping for more but could be wishful thinking! Almost think I should have gone bigger with the heads but its crazy how much the cost changes for a bit more hp's if you know what I mean! Also just wanted to say what an awesome site this is so much to learn just by reading all this info!