head casting number 4772576?

Kewl...I didnt realize the price you quoted was for 2...lol. I had one of the new Magnum castings that Hughes sells in my hands Tuesday. They look like they have a lot of potential too. I'm building a 418 FAST type engine for my own Swinger in a month or so. These heads might be a much better way out than the 915s I have for it. Do they have the hardened seats already?