Yes "port" because it's the ejection port side... we're talking about a rifle's receiver, not a ship.
BSA, difference with your "worn" rifle is you didn't put that wear there yourself. No idea you were a lefty, but that makes sense. Can you please put up more of the same pictures over and over? Thx.
Couple of Finn's 30-06:
A MT of mine... how Levers make the most sense mounted for RH shooters, but to each his own.