IMHO the bolt torque is less important than the very common practice of sticking the long bolt in from the bottom because someone forgot to install it before fastening the assembly to the block. With the bolt upside down, vibrations will loosen the nut and the bolt will fall out on the pavement! Adding a lock pin to the threaded end is nearly as difficult as re-assembling the motor mounts correctly. Can't tell you how many Panteras I've seen missing one or both those long bolts. Without the bolt(s), substantial powertrain movement will occur. Take a look at your pride and joy!
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