Car wont idle, any ideas?

Engine is a 383, 915 heads, Mopar purple 484/284 cam. Eddy performer intake.
Switched to a Carter AFB -67 carb instead of the Edelbrock 750 Performer carb.
With the 750 carb the engine have 8 inches of vacuum, no problems with the idle. Just that annoying of idle hesitation.
Figured I could try the AFB to see if there would be any improvement with the of idle issue.
But... the engine wont idle with the AFB, only way to keep it going is to pump with the throttle.
Any ideas?
Any and all help is appreciated.