Weeelll........I actually rang Holley tech and asked them about this before I bought mine. The Sniper has 4 x 100lb/hr injectors, one in each of the 4 barrels in the throttle body. 1 x O2 sensor in one down pipe, which tells the ecu what fuel to provide. The ecu commands all 4 injectors equally and at once. So unless there is a noticeable difference in the fuel distribution to each bank (eg engine v badly worn) then each bank, and each cylinder, gets pretty much the same fuel. I used an adaptor/spacer plate, which was open with no divider, so all cylinders can draw equally-ish.
That's my understanding, and all the plugs now look roughly the same colour - a nice light tan, rather than the thick soot they had beforehand.
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