Stephen,

The goal is to have zero incidence between the wing and the horizontal stab.

Make sure the wing fits flush in the wing saddle. Place the incidence meter on the wing and then prop the nose or the tail up until the incidence meter reads zero degrees. You now have a perfectly level wing as it sits mounted in the saddle.

Now mount the horizontal stab. The wing should be level from your previous reference point check of zero incidence. Now set the horizontal stab so you have zero incidence in it, as it compares to the wing. Both should be at zero otherwise you will need elevator trim in flight to offset either positive or negative incidence.

Likewise, a friend of mine has a modified incidence meter that allows checking, I believe the term is the Cant angle, or what I simply call, the left to right alignment angle of the top wing to the bottom wing. [8D] With the plane sitting on it's gear, and the lower wing mounted, I then mount the upper wing to the cabbane strut with both bolts inserted. I used the measurements in the directions to mount the first interplane strut, which for the Pitts was 3 1/4 " from the TE of the aileron to the TE of the lower interplane strut. Then I place the meter vertical, on a level service, level and against the lower wing leading edge at the Interplane strut so that the top of the meter makes contact with the upper wing.. ( Picture a vertical ruler on the floor making contact with the leading edge of both wings to get a better picture) I then slightly twist the upper wing either left or right to get zero degrees variance between the alignment of the upper wing to the lower wing. While holding the wing as still as possible ( need some help here ) use a marker to mark your drill points on the second interplane strut. Check both side at the interplane strut reference points to see that the variance is the same. When completed the alignment should be to within zero to maybe 1/2 degree, left to right of center.

I hope this made sense and has helped.