I built my own Cobra tribute. The radiator is small and mounted vertically. The air flows through the radiator and is diverted out the side of the car behind the front wheels. I am not running front inner fenders. The body is sealed in front and along the sides of the engine compartment. I added a second set of side vents. I'm not an engineer and I haven't tested air flow.
I wasn't building a race car. I have been on a road course and have driven it a lot on the street with out overheating issues. The Engine is an LS6 hooked to a Tremec 6 speed. I use C5 Corvette suspension. It only has a Cobra body shell I know. But, I like it.