The emblems went away during the '77 model year. Seems like I remember a rumor of some '74s not having them, but I doubt it. More likely someone just removed them in the past on this car.
Check on the inside of the fenders for emblem mounting holes that have been filled in. It's also possible the fenders have been replaced, but the emblems were not re-installed. In that case, there would not be any evidence of the holes, since the holes were drilled on the assembly line for the emblems.
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Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"