Ford 260-289-302 V8 PERFORMER RPM 302 (1500-6500 rpm) Designed for street 289-302 c.i.d. Ford V8s. This dual-plane high rise manifold has excellent high rpm power while retaining throttle response. #7121 is stock replacement/street legal part for Shelby Mustangs with 289 c.i.d. V8 with OEM 4V carb; 1965-66. No provisions for exhaust heated choke. Available with standard finish or polished. Aftermarket 4-bbl carbs are not compatible with Ford Auto Overdrive Transmission (AOD) unless used with Lokar bracket SRK-4000, see note at bottom of this page. Available with standard finish or polished. Carburetor Recommendations: Edelbrock Thunder Series AVS or Performer Series carb, 600-750 cfm , for auto. trans. use our #1483 & #1490 or #1844 & #1845 Installation Notes: Will not fit 255 c.i.d. V8. Recommended intake gasket: Edelbrock #7220. Manifold Height: A-4.30", B-5.50" see A/B Measurements. Port exit dimensions: 1.05" x 1.86".