I saw the comment about ported heads. I have quite a bit of porting experience, although it is mostly on Mopar heads.
www.shadydellspeedshop.com Note: my brother Ryan is the one who runs the shop now, and builds the engines there, not me. I started the shop with my brother and worked at it in the past. But anyhow, I am thinking about putting an LS motor in my next project, and would love to port a set of LS heads to see what I could do with them. If you are interested, we might be able to work something out. Talk to me offline if you want.
dkj103@psu.edu
Dave