Tsubaki just nailed it. I drilled holes in from the transom with a long drill bit. Who ever had the boat before me drill one hole from the bottom. I put another one in approx the same location on the other side of teh bottom. I went ahead and ran that hole all the way thur the floor. I used that pilot hole for my hole saw and cut a 3" circle out of the floor. I dug the foam out(it was dry) and put the shop vac hose in the hole, taped it shut and let it run for about two hours. I may have gotten enough water out to fill a spoon. I left the boat jacked up real high so in case anything ran out of the holes in the stern, I sat buckets under the holes. I may have gotten a quart out total. Long story short, don't worry about it. As long as it isn't springy, your good to go. BTW, Mckees are real heavy, a lot heavier than you think
heres mine when i started
fisnihed
on the water
BTW, when you redo the boat, they run better with weight forward, trim wedges on teh motor help a lot as well. Mine had a 60 Mercury on it and it was just about perfect, my buddy had a 70 Johnson on his, and while it was able to pull water skiers and outrun my 60 by far, it was just a little too big