It is, but that head should have been induction hardened in the exhaust seat area. It is possible that the load on the engine made enough heat to beat the seats out of it.
I've literally installed thousands of hard seats. A Ford FE engine was made in the tens of millions and not one had seats for unleaded fuel. That and all the other heads that need them. If those heads ain't fractured, put hard seats in there and forget it.
If you can't find a shop that will mag the heads and do it, find another shop.
