I have already found that I have a 1969 engine block in my 71. This was confirmed by casting number. I have since detailed the engine and when I took the valve covers off these are the casting numbers I found. Can someone help me decode them as to horsepower, year, etc.

A257
333882
GM38

Thanks.

333882.....74-80...350/400......76cc chambers

http://www.mortec.com/castnum.htm

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