One should look for this information in a Chevrolet Master Parts Book for the period. If someone near to you has one of these that you can see, that would be most useful. i have a 1929-1952 MPB, and also a 1933-1960. i'll see whether i can see anything helpful. If you're a member of VCCA, you might try contacting the technical advisor for your vehicle.
God's Peace to you.
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