Think your doing A-Ok so far. What is your idle? The big knob on the top of the carbs sets initial idle which should be 1,200 to 1,800 depending on the year. This is a start point.
Each carb has an air screw that should be 1 1/4 to 1 1/2 turns out from lightly seated. You should have set your floats to 26mm with the new needle / seat combo you ordered.
As for power no 1,4 would do it. Surprised if you made 40 MPH.