All of the restored cars I can find just have the screen. Funny enough found a corvette forum where they were discussing the 15 rear wheel horsepower that screen restricts. Wonder if that foam is a modification so people can drive them around. From what I understand L88 was considered a race only engine.
The reason that all you ever see is the screen is that the air filter is mounted in an air box in the hood. When you open the hood, it lifts the air filter up off of the engine, leaving the flame arrester screen on top of the carburetor.
