The cushion style mount is very strong. In actuality, it's not only the strength of the mount, it's the strength of the bolt holding it down. If there is a burly bolt, then you should have no problems. I made a custom set for my 383 Chrysler several years ago. They've proven to be very strong and have given me 0 problems
vendettaautofab, here on the HAMB makes these bad*** mounts(2 pics). Check em out in the Cl***ifieds here