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The rockershaft is lubed via the external line on 8/73-older engines. So it is possible the 68 head would work on the 73 block, if it is prior to 8/73.
It is possible to go the other direction, installing a 74 head on a 72 block for example. It requires reusing the early external oild rockershaft assembly and ignoring the holes drilled for the later internal oiling setup.