The way the adjusting screw is in your photo, the points gap will tend to be narrow with the timing retarded. Turning the screw counter clockwise will widen the gap and advance the timing. Ignore what the gap looks like but read the meter instead. If the screw won’t open the points far enough, they can be pried open wider than necessary with a screwdriver and then the adjusting screw can be used to narrow the gap a little bit at a time while rotating the timing tool back and forth to check the timing.
