I would go slightly rich if I had to go one way or the other. Lean will run hotter and can burn a valve, rich can wash away lubricant and foul plugs as well as contaminate your oil. Burning a valve or washing away lubricant are at the 2 extremes. Other damage can be done too but those are the most common from the 2 conditions. Slightly either way won't hurt anything but slightly lean will blue your pipes and slightly rich can do the same from unburned fuel.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!