Sbm x block

Ok had my nos x block at machinist to have 4 bolt mains installed and line bored. Was told the line bore is way off and that bores were sonic checked and would only be good for a 4.04 bore. Never has been bored and is 3.91 rough factory bored. Which puzzled me and I'm finding this hard to believe. Was told person doing line boring was having hard time finding the centerline to machine main bore. Any comments appreciated.