thanks to Fran and all for sharing the info... it is still a good read.
I have a CE 87xxxx block at the shop now. It has T078 by the starter flange bottom part of the block. From what I have been seeing on the CE blocks it appears that the first number, the year the engine was replaced or assembled in this case, as stated, is 8 for 1968 and I suspect the next number was a month code. I have no proof of this other than looking at a hundred or more CE blocks. I also think the stamp numbers on the starter flange would be T = Tonawanda plant, 07= July and 8 = 1968 matching the pad CE stamp. There are also inspector stamps on the block too.
If I understand this correctly, the year number, CE87xxxx in this case, does not represent the cars model year but rather the manufacturing year aka production year when the CE block/engine was replaced and or assembled. In ccargo's example CE950332 on a 440 block dated G98 casting date Aug.09, 1968 for 1969 production got stamp T0808, again assembled Aug 1968 at Tonawanda and I agree was likely for a 67 or 68 car. but I think was replaced in May 1989. Also with Kurt's examples:
CE9B46015, CE9 = 1969, B= Feb and
CE0A965 0 9, CE0 = 1970 A = Jan
CEN72 502 = CE72 = either 1977, Feb or 1972 without a month,... Could the N be a engine code or for Norwood Camaro???
I might be completely wrong here but I hope my 2 cents of research helps. I also suspect that the block casting number would be the block number you had until they ran out and then would be upgraded to the next better block but this is shear speculation. Can anyone confirm any of this? Thanks everyone, GI Joe