You're lucky, you got 175 hours out of an Aerospace Welding exhaust component. My experience with them has been once around the traffic pattern. And...
IMO, I would be more concerned with the threads being made by the screws than that little dimple. Granted the person drilling the holes ought to have...
Thanks for this picture E, never saw it from this perspective. My recollection is looking out the right rear window at the Cub's unsuccessful attempt...
Look for a low to mid time engine from an airplane which was scrapped for reasons other than engine issues. Like a hangar collapse for example. Since...