IMO-
Yes, you can get 40mph out of a tunnel but it will require more than 40-50hp.
Hydraulic jackplate/trim without jack plate might be the best compromise, for the speed you desire.
Cajun Christian would be able to tell you exactly what you need to achieve your goal.
I'm sure you know this but 35mph is easily attainable for a loaded down boat under 90hp but, when your wanting 40+mph it becomes difficult.
Good luck.
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