The Edelbrock Performer RPM 351W #71811 intake manifold is designed for 1969 and later 351 Windsor Ford V8 high-performance engines with Edelbrock Performer RPM cylinder heads, modified OEM cylinder heads or equivalent. The dual-plane design offers good throttle response with excellent top-end power for the street. Includes bosses for rear water crossover. Will fit 1964-1/2 to 1970 Mustangs. Will not fit under stock hood of 1974-78 or 1979-95 Mustangs. 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.