How about a bad ground. Clean the battery cables at both ends! If the starter relay is getting a signal, that should get it turning. Then make sure the S terminal on the relay is getting a signal with the key in start position. If it is, and no cranking, you can double check your cables, then replace the starter.
Here is a correct diagnosis chart: https://www.teambuick.com/reference/...nosis_1977.php
The complete 1967 Buick Chassis Manual is in the Reference Section, HERE
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