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.