They made them factory. For 383 and 440. Heights differ obviously.
I believe they call it a fresh air filter assembly or air grabber (but not the more. commonly remembered one). I've looked a while, but they're spendy for what they are. Some repops on ebay last time I looked.
I didnt know that. Ive seen ones that has the six pack style base plate with a single 4bbl top. I was thinking of buying a used top & making a base plate.
