[1967Z28]

I think you need to be careful using patches as your basis of reference as those get reproduced. Use logos from original Chevrolet literature or other sources that you are sure are from the era. Case in point, the patch below with the gold border, red "Chevrolet Sports Department", white bowtie instead of blue, and backwards checkerboard pattern, all make me very suspicious. I have never seen the Sports Department logo outlined in gold when seen in print. Also, note the '72 logo is different in print that what your patches show.