There are a couple NA LS setups on HT pushing 200+ on HT.
In order to get decent power without vtec, you MUST be pushing at LEAST 12.0:1 and running some nasty cams to take advantage of that high comp. 1mm oversized valves are a plus, but depending on which piston you choose, you may have clearance issues. ITBs aren't necessary... Edelbrock PerformerX manifold is.
Anything over 70mm in the TB dept. is overkill and even with a 70mm TB, you'd have to get your manifold port matched. Choose your header carefully, you pay for what you get in that dept. I have a set of LS custom grinds from RocketMotorsports in my room that'd I'd sell you if you're interested.
precision and planning is the key to power when it comes to NA.
precision is expensive
-jonathan