MSD box to points.

If you pull one set of points I would check rotor phasing. Google it. The MSD should trigger on one or both sets I don't know why you particularly need to pull one. I also don't know what they mean by "trailing set." On dual points like those one set closes, then the other, then one opens, and THE LAST ONE OPEN forms the spark. It would seem to me that would be the "trailing set" and that is the one that should be trigger I'd think