Thanks. You may find what you're looking for on one of the following sites, I think I saw some blackmouth curs advertised. I'm pretty sure you'll find what you're looking for on the baydog site. Check it out.
Hope this helps!
http://www.baydog.com/purebreds.htm
http://forum.gon.com/forumdisplay.php?f=28
http://www.sqdog.com/forums/index.php?showforum=6
http://www.squirrelhaters.net/forums/index.php?board=3.0