Many years ago, like 30 i had this happen, I had mopar racer friendfix it at his shop, Hes deceased, so I cant ask what he did. The cover actually came off a 70 340, now I couldnt tell you if it was a for sure 70 cover, but it looks like my 72 cover. Here's a pic rotor towards 1, piston at top and as far as I can tell the mark must be at 12 oclock, Its where I cant feel or see right now . I HAVE CLEARLY MARKED WITH WHITE PAINT,NOT THERE.