I would have to go back and check, but I believe the pushrod pinch in the smallest in most small block mopars. The apex area at the top of the short turn is the biggest problem however. There is a little bit of time for the air to expand and slow down after the pushrod pinch. Not so after the apex. Ideally, the area at the apex should be larger than the throat area. If it’s the other way around, the air is expanding as it goes over the short turn. That is a recipe for disaster - separation. After the apex the port needs to converge. This controls separation to some extent.