Series 5 Intake Manifold machining drawings

[21raceabout]

Looking for a set of machining drawings for the Series 5 intake manifold (aluminum casting with flange provision for cross-over pipe heat/exhaust down pipe).  I need to finish a repro raw casting that was made some 10-15yrs ago by the same owner who had the repro engine block cast for his car.  Thinking that machining drawings must have been made up (or the original factory drawings) to facilitate finish machining of the repro intake for his car. 

Thanks in advance for any leads.