.001/inch sounds like too little. It is very important to not make the gap too small. If the ring ends butt together, the ring will lock into the bore. The rest of the engine won't like it too much that the piston stopped moving or the land broke off, depending on the direction of travel.

I don't know how reliable this place is: http://www.aa1car.com/library/ring_end_gap.htm (first hit on
Google). They recommend .004/inch of bore. That sounds more appropriate.

You probably won't go wrong with .015 on that.