I'll answer myself on this one. There are 9 characters stamped on the block, just below the head gasket and in front of cylinder 3. The first 2 letters are the "engine year code" and are as follows:
CK: 1977-1980
CR: 1981-1982
JK: 1983-1984 standard diesel
CY: 1983-1984 turbo diesel
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