Edelbrock part #2121 Performer 289 intake manifold is designed for street 260-289-302 c.i.d. Ford V8's without EGR. Will not fit Boss 302 or 255 c.i.d. V8's. Edelbrock's Patented Dual-plane, low-rise design with a 180-degree firing order greatly improves torque over a wide rpm range for excellent throttle response from off-idle through 5500rpm. The Performer intake manifolds are ideal for passenger cars, trucks, 4x4s, tow vehicles and RVs. Edelbrock carbs will work with Ford automatic overdrive trans (AOD) when used with Lokar bracket SRK-4000, for more info call (865) 966-2269 or go to www.lokar.com.