I have seen a couple of references to Datum and AIM information. Is there book or reference list out there that the surface plate inspectors would have used to check body tolerances? I'm welding on new cowl sides and the upper plenum. It already appears that one of the cowl sides is higher than it should be OR that end of the plenum is low. This is right where the two parts meet and only the upper half of the plenum appears incorrect relative to the cowl side. The lower surfaces glove fine at the reinforcement just above the kick panels. In other words I think the vertical fender mount bolt pad on the driver side is too low.
THANK YOU for any responses