In this case if the hole is smooth the diameter is large enough, there should be no issue. The plate is held to the converter by clamp load. It's not being driven by contact between the bolt and the hole anyway. Clearance is cclearance. Like I stated earlier. B&M plates never fracrure at the hole. They fracture about 1/2" away. A B&M plate is a drive plate, not a flex plate. Any misalignment or clearance in the crank snout can cause them to fracture.
Doug