Hi Bill, I'm known as 36j1967 over at Team Camaro and I have been doing a little tracking of the CE Tonawanda assembled blocks. Read this thread and if you have any questions I'll do my best to answer them. I'd like to have the cast #'s and dates from this block and have you check the surface under the starter for an assembly date. I've also found some of these blocks to have a matching partial vin at the rough casting near the oil filter. Check it out when you have time and post it up.
Look for that partial to the right of the CE code as well. I enlarged the photo you posted and I might be seeing a digit?
http://www.camaros.net/forums/showthread.php?t=96301