Closed return valve

[Cobra29]

On a recent trip to the Bahamas, when loading things into the cockpit hatch someone inadvertently kicked the port fuel return valve to closed position. When I started to leave I noticed the engine hunting for an rpm level but adjusting the buffer screw all but stopped that. She ran fine, although very rich (starboard engine believe it or not) for 157 miles. When offloading at Treasure Cay, I discovered the problem and set the manifold properly. She ran great during the tournament. My question is what problems can I expect from running her like this and is there anything out of the ordinary that I should change out or inspect more closely. Thanks in advance.

Gene Hill