This might be premature and definitely short notice , but this head on Ebay might be a timely investment if you anticipate a future/ imminent valve/head project. You might be able to pick it up cheaper, ahead of time, have whatever done that may still be needed, and do a quickie swap job rather than having you car down while you drag the head to the shop and back for inspection and whatever work. Rebuilt heads seem to run from a low of maybe $300 and continue upwards depending

If it turns out your head is good and you don't use this one you could just turn around and put it back up for auction!

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1860268971

If you've had the car awhile and you are just now noticing the problem it would seem logical that some failure is underway and if you accept the inevitable repair scenario there's no time like the present to start acquiring the resources to do the job completely and competently. If you are planning on keeping the car a while you will want the piece of mind a good job ensures and you will enjoy the satisfaction of having mastered the skill, knowledge, patience, and perseverance that success will require. Good Luck in any case!

Do a search of MarkM's threads and you'll get an interesting picture of where such a journey might take you!!!!!

From:
http://www.peachparts.com/shopforum/showthread.php?threadid=31012

To:
http://www.peachparts.com/shopforum/showthread.php?threadid=38392

and plenty in between, lots of commentary and specifics.