That wake will be massive. What prop is on there right now, I'm guessing the 13.5X17.5 with the HH. You will need at least the 537, probably the 1235 with that weight. It will be one nasty wake though.
That weight setup should be nice. You will probably want to pull up the wedge with all that water ballast. How long is the run for the contest? If it's short then you'll probably want to reprop. That being said, I can plane just fine (obviously taking a little longer) with 3K in my LSV with the Monsoon.