Here is an Ebay auction for a C4OF-AL Hipo carburetor by Ebay member "pashli0" with a starting bid of $2,990.00:
Rare and unique! This is an original Ford Autolite 4100 carburetor for 1965 Mustangs equipped with the 289 Hipo engine. It is the correct carburetor for GTs and K-code (hipo) engines. This unit is guaranteed to be all original and complete. It was restored and rebuilt professionally in Nov 2011. Item has been stored in dry, heated basement since. It was intended for use as a high-end restoration. The Shelby/Lemans-style carburetor was chosen instead. Please see photos for details. This unit has never been removed from its original wrapper after having been restored completely. (see photos for all details). Part is stamped (with original tag) C40F-AL. This is a very rare find indeed. Please review photos and ask any questions before bidding. Item is guaranteed to be the real deal as there are "fakes" being sold. I will add insurance prior to shipping.
Ford Autolite 4100 65 1965 Mustang Hipo Carburetor Original | eBay
-Fred-
This C4OF-AL Hipo carburetor received no bids by February 27, 2022 and therefore did NOT sell.
-Fred-