Search: 4v Carburetor. Have a two Holley kits, one tuning and one jet kit, and a box full if miscellaneous Holley rebuild/gasket/tuning parts (not pictured) It features a Ford Autolite 2100 Replica I changed to open pod setting but not quite satisfied Locate the two air/fuel mixture screws on the metering blocks Nozzle, Main 8 Nozzle, Main 8.