I do believe lots of people tried to utilize USED holley carbs that were warped and "fiddled" to death. Always good to go new with the 2 carbs unless you KNOW the carbs are good. Lots of guys running 2 double pumpers on an 8 to 1 small block ect ect . Seems the big block mopar is fine with tunnel rams on the street but big block chevies are very sluggish down low.