I personally believe tha open cone made more wheel HP( I won't even get into tha error of margin, af ratio, and other variables) bc of yes more airflow. BUT I'm assuming( don't say it) Tha runs were open hood runs? Us LS1 guys learned a LONG time ago that open hooded runs made more hp, cuz of better airflow BUT.... Give me tha 30-40 cooler inlet temps on tha street "with similar flow of course," and we'll see your extra 2HP on tha dyno give up close to a tenth to me in a drag race. And I WONT even mention tha added benefit of less KR from tha cooler inlet temps.
Happy Boosting