Yeah Buzz, it's all a piece of cake,just ignore the BS and what remains is what ya have to do.
I bought that aircleaner on Ebay for pocketchange,it's some universal 2bbl paper filter thing.I cut out the bottom,formed a piece of sheetmetal to fit the 5 inch Holley opening,got a 10 inch diameter by 4 inch high K&N inside.On my wife's 51 truck, I gutted a stock oil bath that had a rotted bottom,made a similar adapter to fit a Holley,fitted a K&N to that one also.