With the Tonawanda build of 0805, that Suffix should be 2CS..
On Suffixes that start w/ a number keep in mind the known 4T & 4U Suffixes for the '68 Chevelles...also remember that L36 Suffix we were all looking at a few months back in the Canadian '68 Big cars...was it 3S?.
What's the castings and dates on this one indicate...maybe early '69 car?.
It couldn't possibly be a for a 68 car...could it?

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Vin sequence anywhere?.
~ Pete