You could put an ad in the parts wanted section here:
http://forums.maxperformanceinc.com/...play.php?f=450
If you haven't already, join the Pontiac-Oakland Club International:
https://www.poci.org The monthly magazine is worth the admission cost and it has a good classified ads section. There are also local chapters throughout the country, chances are there's one close to you (by the way, it helps if you put your location in your profile.)