Ported Indy VS open chamber ported W2
read this for some help and enlightenment. While not a end all to a topic like this, it should help shed some light on the topic and your understanding.
http://www.hughesengines.com/TechArticles/7choosingheadsaluminumvsironwhichonesdoyouneed.php
Old man, 7900!!! WOW! Turnin some RPM there ain't ya!
I hope the OP isn't doing this, then again, LOL I hope he is. That kind of power will put 99% of brand X on the trailer...or there tails under there legs! One heck of a street car that would be.