An IR intake system does have different requirements. You need to limit the amount of overlap, because that limits the "fuel cloud" that Webers were famous for. You limit overlap by increase LSA and decreasing total duration. That is what decreases the lumpy idle that you're talking about. Look at the Thumper line of cams. They get their character simply by decrease LSA to 108*.
Also, a "huge" cam will not behave like a huge cam in a stroker. It will be smoother, and act more like a smaller cam.
My point is, an IR engine with EFI will not behave like a carbed race engine with a wild cam. And that's a good thing! It will take that wild high HP engine and tame it, make it purr like a kitten. Until you stomp on the skinny pedal - and then it will scream like a banshee and take off like a rocket.
Been there, and done that.
