You can send your head off to have it worked but you will spend $1200-1800 for headwork and givin that you are having to stay "stock" I doubt you will see any gains. I would just make your own type R, maybe a thinner head gasket to get a little more compression. Honestly if you want to make the most of it, you are going to need a SPOON setup. They race classes where ONLY stock engines are required, all their parts are extremely precise. I know it sounds stupid to say, "BUY spoon ****" but thats what they are known for.