you need to have the head checked to see if it's warped .also check the block for smoothness
you shouldn't just replace the gasket .
going with a metal hg is not cheap and is really for someone who wants to go mental with boost
a stock gasket doesn't need the surface as smooth as a metal gasket . the stock gasket material is more forgiving of the block and head surface
condition
http://www.ddmcse.com/turbo/bhg_2003.htm
here is a shot of a metal headgasket
http://www.ddmcse.com/turbo/images/mhg.JPG
tearing apart the head is really not as hard as you may think
just takes time, not really any special tools need a torque wrench
i used this guide when i did my 1st one ,, but i didn't go through the effort of preparing the block which is why I got to do it again.
http://www.geocities.com/MotorCity/Speedwa...y/1636/bhg.html