there is a much better way than either of you 2 suggest. there is no reason to remove the manifold to get to the PCV valve.
you can get to the PCV valve easily with the heat shield removed and by removing the thermostat housing. with the housing removed you can get to the bolt that holds the metal tube from the PCV to the block (supposedly you can get to this torx bolt without removing the housing but i never figured out how). remove that bolt and then pull the tube away from the block and then you can reach back and grab the PCV valve.
chances are its probably time to change the coolant anyways. not to mention you dont have to deal with the rusty exhaust bolts.