Yeah but .... the whole idea of individual manifold runners is that there is no interference from adjacent cylinders. The sort of manifold you speak of is called an interference manifold and usually any 2 ( or more ) barrel carb usually have a primary and secondary barrels to provide adequate velocity at low and high revs respectively , which is its advantage. It would probly be less of an issue on something with an even firing order .... like the old British 360 deg twins . I also think you would have a shit of a job getting the weber to behave without some serious #ucking about
