I found the original crankcase vent pipe that runs from the valve cover to the air cleaner breather element! However, I need some help figuring out the options that originally came on my firebird. My PHS documents show it was originally sold in San Jose California. The actual list of options include the "Firebird 400" package, which included a "chrome air cleaner, rockers, and oil cap." It also read "Air Injector exhaust control and crank case vent closed circuit."

What did the original oil cap look like?

I think the air injector exhaust control is the air/smog pump?

What is the crank case vent close circuit? Is it the oil cap? If yes, what did the original look like?

Thanks!