Personally I would just go with the cowl. They are made mostly for clearance issues but any kind of heat evacuation that comes with it will be nice.

IMHO I think forward facing scoops look like shit. But thats just me.

As for the ram air, you will have to have some kind of plate around the carb that keeps air from flowing past it. Otherwise the scoop wont do anything other than having cold air come in and creating extra drag on the front end.