i need to lean out my edelbrock carb a little bit. i really dont know much about carbs, so im having a hard time here. i went to the parts store to get metering rods and seats, and they asked me what edelbrock carb i have. one of the numbers was 1407, and some other ones. how do i tell which one i have? is there a number that i can find on the carb to help me out?