[WSSix]

Bob, you could spend some time with a vacuum/pressure gauge a take readings at different spots on the car to determine where changes need to be made to allow the air to flow. For instance, you may find that a partial belly pan in the engine bay will help evacuate air from the bay by increasing air pressure in the bay relative to the outside at the vents. The air will flow from high to low pressure. The hard part may be to achieve this while keeping the pressure in the bay lower than it is in front of the radiator so air will continue to flow through it.