Question on holley 4150

I have been reading up on wide band o2 sensors for tuning and they are saying that 13.8 is perfect for air fuel mixture. Well im a little salty with my engine builder now because in looking at my dyno sheet it seems to be running super rich. Im wondering what everyone is running for jet sizes.

The dyno run was done with 71,s. Everybody I have talk to said mopars love fuel? am i using to big of a carb? It seems to hesitate bad off idle bursts of throttle and just recently started to pop and die.
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