When I was in the process of rebuilding the engine in my 66 GT350 a friend asked if I was going to install a scattershield. I said "no, the car did just fine as a B/P race car for 6 years on the original bell housing so should be good".
He called a few days later and said "come on over, got something to show you". Figured it was some rare part he scored. But when I got there he showed me a big gouge in his concrete driveway and several 1-3" holes in the siding of his house about 20 ft. away.
He explained that he had taken his 66 GT350 (early Hertz 4-speed) for a drive, and after opening the garage door gave the car a throttle blip as he started pulling in when there was big explosion. Apparently he determine the pressure plate exploded, destroying the bell housing with most of the shrapnel going down and bouncing off the driveway ricocheting into the house. Some of the fragments also went up cutting the brake line running along the firewall and denting the rare original all steel hood.
Since I had my engine out and was installing new brake lines, I went back the next day and gave him my original lines.
When I got back home I located and immediately bought a Cobra scattershield.