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The Nasty site listing as shown indicates both CPA and CPD were MT codes for '71..
Considering the casting date it's probably a '71 but get the Vin sequence if it's there and count 8 digts back from the end for the model year also the plant digit and last six may help indicate which car line it was originally in..
~ Pete
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VIN # :
11 L 126542
1 : Chevrolet
1 : 1971
L : Los Angeles
ID # : 126542
The crank is an
815NF