It is easier to set your float heights with your carbs on their side, with the hinge of the float, on the top.
So, compared to your video, you'll want to 'roll the bank of carbs to the left (counter clockwise) about 90deg.
In this position, the float valve should be all the way in the bore of the float seat.
The floats should now be 'hanging' from their pivot, and the 'tang' of the float, just resting on, but not depressing, the tiny post of the float valve.
It is in this position, you take a float height measurement, and adjust the tang if needed.
please take a look at the FIRST pictures in this thread.
http://forums.sohc4.net/index.php?topic=87141.0;nowap