I too started out with the Aeromotive 340 running a e70 blend and at 12psi the pump just could not provide enough fuel giving the z AFR cut while in boost. Had her upgraded to a Walbro 450 and she now runs Nice & Rich under wide open throttle at 12psi. I can now even run a higher blend of "e" since upgrading to the larger fuel pump.
With you running 14psi you definitely need to find a way to add more fuel to you're new build. You should hit up Charles from CJ Motorsports as he is working on a twin Walbro 450 pump setup.
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