Designed for 1500 to 5500 RPM performance, low profile for hood clearance on most vehicles, air-conditioning/front oil tube bosses included, stock alternator brackets do not fit, use Edelbrock fuel line kit PN[8088] with our carburetors, carburetor center-to-center dimensions = 6-7/16 in., use Edelbrock linkage kit PN[7094] with our carburetors, best matched with Edelbrock 500 CFM carburetors