Designed for street 260-289-302 c.i.d. Ford V8s without EGR. #2121 is stock replacement/street legal part for 289 and 302 V8s with OEM 4V carb.; 1966-72 (1973 non-CA); except stock equipped EGR. Will not fit Boss 302 or 255 c.i.d. V8s. Aftermarket 4-bbl carbs are not compatible with Ford Auto Overdrive Transmission (AOD) unless used with Lokar bracket SRK-4000. Available with standard finish, polished or with PermaStar or new EnduraShine finish for a look you've got to see to believe, see Optional Finishes.