I side with Broaddus on this one. NOt that I think Berny would be a HoF center, but I agree he's better suited there.
I think it would be an upgrade over Costa and he'd be a solid player in that spot. We'd need a RG that could immediately become the 2nd or 3rd best offensive linemen on the team, and a RT that could be the 2nd or 3rd best offensive linemen on the team.
LIvings are Berny (as a center) are ok, but they should be your 4th and 5th best guys on the OL.