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thats what the books say, and agreed its the general advice. I did some tests on my old BRM engine and saw no difference whatsoever in changing the inlet length (dyno proven) - go figure. My current engine has what you might call a short inlet length (85mm trumpet and 80mm dome clearance) and it just clears the bonnet - not far off what you found but my engine is 17mm lower down also. It is not short of torque believe me.....personally I would keep it under the bonnet for better aero and filter life
you want 40mm min inside the filter
the filter will be enclosed not 100% how as yet. won't be doing anythign drastic til I really have to!