Harmonic Balancer 130ft/lbs on Stand

I want to install my harmonic balancer this weekend on my 340/420. I have the balancer installation tool and I have torqued the balancer bolt with the engine in the car a handful of times. I made a bracket that bolts to the balancer, and rests against the k-frame to keep the crank pulley from rotating while I torque this bolt, or remove it.

But this time, the engine is still on the stand. How do I get the balancer nut torqued to the 130 ft/lbs per the spec if the crank is able to rotate?
Also, should I add a lock washer to this bolt if I can't torque it to the spec?

Thank you.

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