On the test stand the pump was putting out that much fuel, we set the pump around 110 horse of fuel, I haven't dynod the tractor to verify what it is making but it runs much stronger than before.
Had the pump on my 856 rebuilt, first time on the test stand it was putting out way over 1456 spec, right around 200 horse worth, we set it around 110, haven't had it on a dyno to verify though.
How big an engine and are you running speed limit or open?
The stock manifold manipulates the intake pulses better, I found better torque and throttle response with the stock manifold.