Dual Carl Plate, polished. Only has one carb bolt pattern, for Edelbrock and possibly other carbs. HOLLEYS WILL NOT WORK. Chinese "Holley copies" will not work either. Bolt pattern 5 13/32"x5 13/32". Check your carbs to see if they will fit. Has some type of injection ports, not sure exactly what they are for. (Total of 8) No screen or gasket.