I can't say if the fit will work as I am not a "flatty" guy. As far as running 3 carbs and only hooking up 2, you will have 3 hoses going to all the carbs. How will you NOT have gas go to the middle? The only way I see this beng done is not having 3 hoses which will not look that good with 3 carbs. Something I think you need to re-think.