I have a 70 Bee with a WILD 383 4-speed in her and I was busting motor mounts ALL THE TIME, then chained the motor down and busted the chain a few times as well.. Then around the time I was deciding to park the car for good Schumacher came out with the poly-lock motor mount..I said what the hell, and yes they were spendy, BUT I have NEVER had a problem with the motor mounts ever again and pound on her even harder GOD I LOVE MOPARS!!!!