Here is what I got for you a little bit ago. I did not measure across where the stud is located because my hold down nut it is quite a bit taller, but this should get you some good info. I should note that the top of my air cleaner is the Summit Racing
K&N filter type and it's flat. I used a 2x4 as my straight edge as you can see in the pics and all measurements are made with my metric scale. I also took a picture of the air cleaner bottom as it sits on my carburetor so you have an idea of what you may expect given yours is a 2" drop. I can measure the height of the collar on the base if need be. The distance between the stud and the cowl is roughly 13.25 inches.
You can see the hole that I cut in the hood much easier in this shot.
This is the leading edge of the the hood scoop hole near the center of the hood. You should be able to make out the center body line to the right of the scale.
The rear part of the hole.
Right side front.
Left side front.
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Right side rear.
Left side rear.
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The air cleaner base.