These are absolutely the finest Carburetor Kits available anywhere at any price! We have combined every possible add-on feature and incorporated them into each kit to give you long and improved performance from your Holley Carburetor. Most of the features you would buy seperately are already included. Listed below are just some of the additional components. It Takes only five AED Carburetor Kits to cover virtually all Holley performance carburetors, which greatly reduces inventory and makes kit matching extremely easy. For example our 4150 kit fits all double pumpers from 390 through 1000cfm units. Our 4160 kit fits all vacuum secondary carburetors from 600 through 870 including the new "Avenger Series". All Kits are attractively skin packaged in multi-color layouts for a great point of purchase display. Listed are just some of the standard features that set our kits apart from the competition.