Edelbrock 2104 Performer Intake Manifold 50-state legal for use on vehicles originally equipped with 4-barrel carburetors Comes with rear water crossovers Port dimensions are 1.88" height by 1.14" wide Manifold height is 3.50" in the front and 4.60" in the rear Accepts late model alternator and air conditioning brackets Fitment : 1987-1991 Avanti II / 1987-1987 Buick Regal / 1987-1989 Excalibur Phaeton /1987-1988 GMC G3500