Very likely an 87 then.
The head part number as cast near the #2 injector is R 603 016 XX 01 where XX describes the replacement sequence. Original heads will have a -14-, the 3.5l engines originally cam with a -17-, the latest revision is -22-. The heads are interchangeable but moving from a -14- to anything newer requires some simple modifications. It's all in the archives.
Sixto
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