The discontinued Beretta 627 action, which was the same as the 625 and 626, are also the same basic action that Beretta uses for their newer 471. It's a basic, well-built, Anson & Deeley type action with double Purdey underbites; no third fastener or side clips on those models. I would suppose that if one could build a 9.3x74 using a modern action of similar design, you should be able to do it with your 627 action.