Lynn, unlike my brain fart on your previous thread, in this case '67 and '68 should be close if not exact, since they are both short water pump.
Attached are pages from the '67 AIM along with pix from a '67 327 that I have no reason to believe has ever been apart.The foremost manifold bolt has a 3/8" stud to mount the bracket, no spacer. The second manifold bolt passes through a 3/4" spacer.
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