That's a LARGE difference in pumps.
I'd say it'll be easier with the big pump.
You gonna have one modded pump and one stock one? If so, I'd stick the stock in the valley and put the modded one up on the PPE bracket. Reason being, sometimes the modded pumps (not necessarily talking about Wicked's pumps) are less reliable and may have problems that need corrected moreso than a stock pump and, as you know, it'll be MUCH easier to swap out the modded pump if it's up top and not down in the valley.
So, has that power level been achieved with two stock LBZ pumps? Probably but it would surely be easier, from a fuel supply stand point, to do it with at least one modded pump in the pair.
That's my $0.02 with no personal experience at those power levels but have been around some of the most modified pumps around.
C-ya