Mike,
I don't recall seeing an engine with slanted bank(s) where the intake was on the underside of the slant.
It doesn't mean it hasn't been tried of course.
Consider a reverse of the standard locations of the intake and exhaust on a V layout engine.
Is it not practical to have a significant portion of the intake tract running up instead of down?
I'm not asking about changing an existing engine etc.
Thanks for any thoughts on this.