There are two issues at play... cooling and keeping the pressure in the cowl from going positive and affecting the carb tuning. In order to avoid pressure, the 2:1 ratio must be adhered or a nipple added to the carb vent port and a line run to neutral pressure inside the fuselage.

As to the cooling, others have laid that issue out well... the intake has to be directed at the cylinder and head. I'd close (damper) the two upper ports about 80% and open the bottom one as much as esthetically possible. If that isn't to your liking, then it is a matter of baffling (redirecting the air flow) to redirect the intake of the upper two holes so that the air coming in them is forced over the cylinder and head.