I think you are missing the point of a race engine, they don't need to rev to 11ty, they only need to be built strong and flowed to suit the turbo. I assume Tony isn't going to fit a GTX45 anytime soon so the stock heads would have been fine with just a clean up. The cooling side is much more important.
Now e85 is available, and any track car owner in their right mind would be running it, there is little need for crazy port jobs and long duration cams imo. Early spool and massive efficiency curves are where its at, track or road...