Does anyone know the torque spec for the motormount thru bolt on a 1980 chevy small block?

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Life in the fastlane surely makes you loose your mind.
http://www.camaro80z.com

Use a ratchet on one side and a closed-end wrench on the other. Torque it pretty tight by hand. I have NEVER had one move using this method.

Tight enough is good enough. The nut is "pinched" at the top of it's threads and it won't back off the bolt threads, even if left loose. All the forces on the bolt are in shear (across the bolt shank) so it's not anywhere near critical to hit a certain torque spec.