Just remember that the person undertaking this project is not very knowledgeable about the dynamics or mechanics of cylinder head design or airflow. And is only doing it to basically check off a box on his bucket list, and is really only a labor of love for him. So it is what it is, and has a long way to go to even be tested, much less proven. So don't expect it to be a contender by any means even against a lump port head.
