I have a Offenhauser kit, like the one first used by Fred Offenhauser, on a new 53 taken on a national tour for promotion. This car is pictured in the "Merchants of speed" post here. The kit includes a Offenhauser Aluminum intake, Stromberg 4 bbl. (450cfm), air horn adapter, Mallory distributor, and air cleaner, either nos dry type or used oil bath. Her are a couple of shots, showing the one on my car and the one for sale.
The kit also has documentation, and includes copies of original installation instructions. More pictures and other info if anyone intrested.