I would look for a 140 73 onward type air box that uses the same filer as the twin carb setup. That will be a lot less trouble to modify.
If the photo is your car I would strongly suggest changing the steering coupling back to the correct rubber one. Poly is not a suitable material and when it fails it will do so without warning and rip in two. I am amazed anyone one is still selling them in all honesty
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