I'm not familiar with those intakes...on mine, their just aluminum intakes with some thick hose (similar if not radiator hose) that slips over both the intake and the carb outlet. So the key is to get the carbs outlet to butt up against the intake as tight as possible, and then clamp down on the hose so the carb can't move. That way, the carb doesn't have any space between the intake, and therefore can't really flex up/down much. If there's a gap, the carb can/will flex especially with vibration. Since there's not an airbox to support it from the air inlet side, your relying on the intake to support the carb.