WIW-Slant 6 Air Cleaner

Got digging through the garage this afternoon, and found this. I'm no slant expert, and need to know what vintage it is and what it's worth. As you can see, it does have some rust on the inside. I'm guessing a light pass with a sandblaster would clean it up, but should be fine to use as is. I just want to sell it to someone who needs it. I'm not looking to get rich. :toothy8: