I am not finding an image of the '64, but it is probably similar to this '68 wildcat diagram.
https://www.teambuick.com/reference/...tra_wiring.php
You would find the resistance wire by starting at the coil + side and opening the harness towards the firewall. You should first come to a yellow wire spliced into the pink (yellow wire comes from the starter solenoid S terminal). Working along before you get to the firewall plug, you should find the resistance wire spliced into the pink.
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