sealing hood to Carb any HP gain?

Try it ,
A cover for the air cleaner to poke through and then maybe some vents in the back of the scoop to let air pass through and not go into the engine compartment from the scoop.
I read on here that you want the air to go through the radiator and its possjble to get back turbulence from a hood Scoop interfering with the path of air flow at high speed.Makes sense