This is a Autolite 4100 for a 1965 Ford Mustang with a 289 and automatic transmission. The number on it is C5ZF-D ( showing a C5ZF C the D has been sold but have more)and is a 1.08 venture the jets are stock primary #48 secondary #58 boosters are primary CH secondary A. It has been rebuilt and restored with all the correct plating done please see pictures. Trade your old one in maybe.Please see my other ads under Holley, Carter, Rochester, Autolite, carburetor, Hi Po carbs