I think I found the answer to my question in Service Letter #25. A 4 foot level beneath the front spar should read between 1.1 and 1.4 inches. The Tangent of 1.3/48=0.0270. The angle whose tangent is 0.0270 is 1.1 degrees. That's for each wing. Mine measures 1.25 degrees. I think I shall go work on something that needs to be fixed. This is apparently close enough.

Cheers,