Edelbrock part 2181 Performer 351W intake manifold is designed for street 351 c.i.d. Ford Windsor V8's. Will not fit Boss 351. Aftermarket 4 - bbl carbs are not compatible with Ford Auto Overdrive Transmission (AOD) unless used with Lokar bracket SRK - 4000. For more info call (865) 966 - 2269 or go to www.lokar.com. 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. This Performer intake manifold is ideal for passenger cars, trucks, 4x4s, tow vehicles and RVs.