[Mr70]

I posted this on TC & thought some here might be interested as well.
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Begining in 1970,upon completion of the regular CE serial numbers,a plant Reused CE numbers preceded by the letter "A" to indicate Late production.

Example: CE0A12345

Flint Plant reused if need be:
A00001-A19999 & A80001-A89999 for L6 engines.
A20000-A49999 & A90000-A99999 for V8 engines.

Tonawanda Plant reused if need be:
A50000-A79999 for their V8 engines.

They continued this practice throughout the 1970's,so when you find a block numbered like this,look at the number after the CE suffix to determine the year..i.e. CE3A12345 for 1973.
CE stands for "Chevrolet Engine",not Counter Engine,although it was available over the Parts Counter.