whats the leanest cylinder?

Since the air gap (and regular RPM) are dual plane intakes with each cylinder fed from 1/2 of the plenum and out of sync from the last cylinder there's not much fuel distribution problem. Also, due to it's design the middle cylinder runners are real close to the same length as the end cylinders because each middle cylinder is fed from the opposite side of the plenum, unlike a single plane. For that reason I don't think it's possible to predict what the leanest cylinder would be. That would depend on the flow characteristics of the heads (unless all ports are equalized some ports can flow a great deal more than others) and if there are any casting flaws with the intake.