Original 4053 HOLLEY CARBURETOR date code 891. Date code reads 1968 SEPTEMBER, 2nd week. This is a Camaro carburetor. The number above that in the picture is the General Motors id number 3923289-DZ. Restored to its original Holley color, all of the steel hardware has been replated to the original finish. Carburetor retains the factory Holley calibration. Very hard to find especially with an early date code like this. Found primarily on DZ 302 Camaro. In a Holley catalog this is also applicated to 396 427 and the L-28 motor.