which one

Thanks for the input. The closed chamber heads are P4532693 castings. with 070904 and 9769 stamped on the end of the head. I was told this was the last of the W2's made. Will be putting on a 360 ,40 over if I can find a good block. Know where there is an R3 . Trying to make a deal on that. But he won't give an inch . Will keep trying to get a deal. I'm leaning toward the closed chamber, because of the history of open chambers breaking. can't afford to keep replacing heads. Can't afford to build W2's but why not. If it's out there and is a good part go for it.