Hey Rod
I have the same heads and my serial number is 57059-2 so they look to be the same number of digits. Also on the right side of the exhaust face, I can find an A067. Take off one of you valve covers, and inside on the floor, near the springs you will see another number ...it starts with TFS ...that is TrickFlow Specialties. I think if you see it you can rest easy. You can almost see the number in this pic...it is like TFS-38F-1 or something
http://www.cobralads.com/engineupdate/DSC00075.JPG.html
Here is a view of the exhaust face
http://www.cobralads.com/engineupdate/DSC00104.JPG.html
hope that helps
Andy