solid vs. poly motor mounts

[Taman]

On a 2nd gen F body, clam shell motor mounts are used. All most impossible to break. I had a 455 in my 75 TA with 575 hp.. I used the poly inserts in my stock clam shell shell. Worked awesome. Instead of the shaker shaking, now the whole car shakes. I have found the stiffer I makes things, the more rattles that pop up.