I prefer to use a moroso solid on the drivers side only.
But my car is a 4speed and i don't want the risk of blowing out a clutch linkage during a power shift run.
Also i drill out the hole for the long bolt to run a hardware store 5/8 x 4" long bolt because that is the size of the k frame hole and i want zero movement i have seen engines move up on the k and stay crooked even though the bolt was tight . Works great and the vibration is not bad even driving on the street .