There's a set in eBay for a great price. They are race ready with titanium intake valves, beryllium seats and aggressive dual springs. $4000 worth of head for half that price
If youre planning on running stock type rocker arms those heads definitely arent for you. Those are low 8 sec heads. The stock type rocker setups are prone to failure at the pedestals with aggressive valvetrains. You should source a new set of stock replacement aluminum heads. They will be a lot cheaper and will accept stock rocker arms.