If you need to check for vacuum leaks I've written a couple ghetto ways in this post

http://forums.2gnt.com/dcboard.php?az=show_topic&forum=5&topic_id=126945&mode=full

Scroll to the bottom. I've see those gaskets go out pretty quick usually due to the oil leak from the valve cover leaking down on it. And you should never reuse a graphite or paper gasket. Metal gaskets are the only reusable ones and some rubber ones as well but you even have to change them sometimes.