408 build up

Thanks for the replies. I am really tired of thinking about all this. As far as where to start, what do you recommend? Should I call a place like motor machine and get their opinion on how to put everything together. As far as heads go, what would be the best for a 408, with no more than 9:5 comp. and not revving much more than around 6000? Or would I have to go above 6000 and 9:5 comp. to get close to 500hp out of an N/A motor. Thanks again