When I got my car it came with a shiny chrome Summit air cleaner...didn't look right.  I found a mid 50's Caddy batwing that looked great and fits on my 4 bbl nicely.  A couple of points though, the 4 inch air cleaner element is too tall for the hood so I got a thinner one,  and for my Fairlane, the hood latch pin just tics the cleaner a little bit as the back side of the cleaner is square not round.  If you want to buy one I paid $60.  They are on Ebay for about $140 for buy it now.  Make sure you get a metal one, there are some plastic ones out there.