The reference stations in the AIM are based on a datum which (as far as I can deduce) is the firewall, however that doesn't make accurately measuring the part relative to it any easier.
I have a pair of GM take-off fenders in storage, I will see if I can get good measurements of the emblem hole placement. That said, emblem stud positions may not be consistent across all versions.......
What I would do is place a sheet of paper over a block of polystyrene (or similar); carefully push the emblem down onto the paper, forcing the mounting studs through into the polystyrene behind, leaving corresponding holes in the paper. Then trace the outline of the emblem onto the paper, remove emblem and cut out the paper outline. Now you have a template to position to your satisfaction on the fender, and mark through the emblem stud holes to know where to drill.
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Tim in NSW, Australia
1969 Van Nuys 04A Z/28 from Clippinger Chevrolet.
Cortez Silver with dark blue interior.
Ran at Lions Dragstrip and Pomona Raceway, with paint by Bob Kovacs of Fresno.
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