I would that the whole purpose of a set back pump is to get your weight further aft. This in turn lets the bow rise, and reduces wetted surface which will give you more speed. Also, it moves the hand hole outside the boat, so if you ever had to remove it while in the water, you can do that without the boat sinking.
Not entirely accurate, but there is some good information there nonetheless.
The entire idea behind setting back the pump is to move the intake hole to the rear of the hull, so when the hull does fly and there is just a small surface area in the water the pump does not lose a good load.
So it's not necessarily about moving the weight aft either. You also don't always have more room if the hull design wants the center of gravity more forward. Or if you have a fairly large transom deck.
Hope I don't seem like I am running over you here, just though more information was needed.
Something to keep in the back if your mind while designing your build. A blower motor is quite heavy, especially an iron headed, inter-cooled, big block. That much weight too far back will lower the freeboard at the transom making the hull prone to swamping. You may find with a heavier motor you will need to keep the motor in its original location, to much weight that far back can cause undesirable handling and an increased chance of blow over.
I would recommend finding someone with a set back Hallet or a hull very similar and talk to them about it. Take your time, do it once.
Good luck.
GT
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