In my Mk 1a two 2.7m oars are easily accomodated. However I can’t tell you how well the boat rows because the first thing I did when I bought her was to fit a rowlock socket on the stern. The Wayfarer sculls like a dream. It is so useful to be able to scull out of a crowded harbour, or off a pontoon then point head to wind and hoist the main. If the main is already hoisted I use the first reef line to brail the sail.
It takes about 10-30 minutes to learn to scull.