i have a set of matching afb 4bbl carbs for a daul quad set up on a 64 or 65 chevy 409 with 425hp option. these carbs are complete but need to be rebuilt . i am selling them for $900. i may rebuild them but the price will go up if i do. these are part number 3804s and 3361s and are numbers matching for a 409 chevy.. i also understand they are correct for a R-4 Studebaker avanti engine with the daul quad. i understand they are 625 cfm. but literature states that as a daul quad they are 500cfm.? they are shown on a mopar rb 440 intake which is not included.. text to 678 557 1294 jimfoxmail@gmail.com