Bumer, that happened to a car I had back in the 70's. You may need to put a limiter on the passenger side of the engine that will tie the engine to the K-frame. This limiter goes from the front of the K-frame to the side of the block near the motor mount or pan rail and prevents the engine from twisting sideways/clockwise if you were looking at it from above. We kept having issues with trans mounts breaking and this fixed our problem. We had solid Sox Martin style mounts and it still twisted without the limiter on there.