My 62 389 Bonneville trashed a drivers side mount. One way of checking is to start the car with the hood open, foot on the brake, go to drive and apply gas putting stress on the mount. When mine went, you can see the engine start to lift up on the drivers side easily even sitting in the drivers seat.
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65 Tempest, 400, TH400
86 Fiero SE 2.8
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