I am now of the opinion that it is wise to do this while engine is apart,as the cost is not much, and the benefits are all good, i have lost count on the amount of oil leak from head gasket posts there are, it seems quite a common thing so, i now change the studs for the ape ones, and also re-surface the head and barrels just tom be safe, you can also toque these heavy duty ones down a bit tighter
Pete