I know full rotor exposure doesn't seem critical for race, but (as in all helixed rotors) all the air is in the triangle formed by the rotor's relative positions just behind the drive nose. Air behind that point is just pulled back into the case and re-heated.
It looks to me that masking the case would be easy (Eaton just closes it up, no special shape) but it may mean moving the case to the rear of the manifold - which will move your pulley out of line. Some pictures may exist of a masked case on a manifold to hint at a good distribution spot (although some OEM Eaton manifolds are just open boxes).

Anyone read anything on this?