The numbers in the Chevrolet Parts Manual indicate that the crank may be a 40-41 216 and the camshaft a 37-53 216. A 216 could have been bored to 3-9/16"; a measurement of the stroke (3-3/4" for a 216, 3-15/16" for a 235) may be in order, when it is convenient.

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Hoyt