The link appears to be drawn non-symmetrical.
If you draw it symmetrical in CAD, starting with a vertical centerline, and then using the dimensions above, you get 30.61 deg from the vertical centerline to the rod hole, and 20.84 deg from the vertical centerline to the edge of the slot.
To the link lift hole, measured from the vertical centerline is 30.21 deg.
It seems like the slot and rod holes would have to be laid out symmetrical to a vertical centerline, but maybe I am missing something.
Pat J
Edit: That 1/4" (typ.) dimension can't be correct, since you can see in the drawing that the sides are not equal.
If you hold the 3.25" dimension, then the angle from the vertical centerline to the lift link hole is 33.2 deg.