I ran the poly lock mounts for a few years with a Schumacher torque strap.

Over time the mounts sheared. The right side mount was real ugly. The engine would twist on the mounts, not lift on the left side.

I found this after my reaction times became erratic, and the drivers side header became the limiter.

I am not bashing the product. They lasted 500 or so passes on my smallblock.