From what I understand these are instructions for piercing fenders for trim and emblems...
These are the codes I have seen personally...
427 M is COPO Style Trim
G R is Z28 Rally Sport
G M Z28 Style trim
427 R is COPO Rallysport
FWIW the engine RPO code on the body broadcast for the Z28 is G.
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NCRS#65120
68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car
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