The 49-51's used a mount under the front of the motor, a mount under the tranny, and they has a pair of "training wheel" mounts on the sides of the bellhousing to account for the torque of the engine. These are not real motor mounts, as they are not supporting any real weight. In '52 they went to the 3 bolt side mounted engine mounts, which took care of the need for the training wheels on the bellhousing.
If you mount it like a 49-51 and use something off the bellhousing to steady it, you will be as good as the factory intended.
