Making sure that the machine shop checks the head for straightness is more important than the brand of head gasket.

When doing this job you should; check the head bolts as wisely mention earlier, have the head pressure tested, checked for straightness and a valve job including new valve guides. Unless this was done VERY recently, you should never take the head off one of these engines without doing all this.

Even in the case of recent head work, if you are changing a blown head gasket the head should be checked for straightness.