Holley Carb information

Hello everyone,
Trying to get some information on an old Holley carb I have had laying around. It is a 3918 carb off a 1968 440. I need to know if it is a 4150 or 4160 and what cfm rating it is. I can't find it on Holley's site, and got tired of sitting on hold for two hours. Any help would be appreciated.
Bill
Author: traintech55