i think you made a good decision with the headers. one of the best mods for most vehicles. looking at the dyno numbers looked like they picked up some nice mid range but droped a little off on the top end. maybe the ls6 manifold will help out with that.

243 heads, hell yea!! and yea you probably could pick up the gt cam for a decent price. and a 100 shot cheap, simple install, easy maintinece. cant go wrong there. i think the spray would really like the longer duration of the gt cam too if you were to go that route.

man im really liking your build you gotta post videos some time.