what bolt lube to use

What does the factory service manual say?

Mymopar.com

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I just looked 67 Dodge FSM and the FSM does not say anything about lub on the bolt threads.

Note the torque on a dry bolt vs a lubed bolt are typically different.

The same torque on a lubed bolt might stretch the bolt more than the same torque on a dry bolt. Meteorology of the bolt will be the deciding factor and what the bolt manufacturer says.

Just my 2 cents