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That engine (and the whole car for that matter) are US spec. 1973 all USA, and 1974 all except California.
If you will disassemble the camshaft part # it reads thus: 110 051 91 01. The 91 is the cam profile code and is stamped into the rear face of the rear journal of the camshaft. A camshaft with a 33 code can also be used in the .921 engine.
All of the M110 camshafts will physically interchange, although the profiles differ.