I've seen and heard the stories, and am a bit surprised.. Back in the day we were one of the first places to install Mopar's Rev Man shift V/bodies,, and built dozens of 727's running behind hemis and smaller,, The only probs we had was tailshafts breaking occasionally,, and the owner forgetting the reverse pattern,, and shifting into the "old" hi gear (now low gear),, and buzzing the engine,, saw a few engines lost that way..
But our news came once a month via rod mags,, the internet has made all these occasional blow-ups more available...
Back then, and now I suppose,, we all went to the track to try and break our cars,, and when they broke,, we just built them stronger,, hearing about a breakage was just to be expected.. But seldom heard of a 727 or an 8 3/4 failing... jmo