346s were the first ones (1971) with induction hardened seats.. The 452s were the next evolution. I would put seats into it because the valve job will grind through it.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.