This billet adaptor is used to install any Autolite, Holley, or MotorCraft 2V carb (up to 500 CFM) on a 240/300ci 1V intake manifold. The adaptor comes with a custom billet insert, which improves ar flow and horse power, and two stainless steel screws for mounting the adaptor to the intake (carb studs and spacers are optional). Gaskets not included. No machining required.