Changing motor mounts with engine in car

I remember hearing many years ago, a guy had a good traction big tire Demon with a 340 4 speed with solid mounts. He ripped a nice chunk of casting out of the side of his original block. No more solid mounts for him or me. I use a short piece of chain around the motor mount bracket looped around the k-member with a piece of all-thread with just a little bit of slack, like about an 1/8 of an inch...
Also NOS Mopar mounts are of lot better quality than anything you can buy today.
I had a friend that had a real nice 68 340 Dart that didn't like my chain idea-a few months later he was looking for another 614 shroud that he had a hard time finding the first time.