Ok I have a GMC 350 in my boat, it weight is 825lbs add the trany and V drive and we are around 900lbs.
My boat holds 38 gallons of gas or 300lbs that leaves 600 lbs to offset.
Now we all know that the farther something gets from a CG point the more it will affect the CG.
So get a couple of people to sit in the bow, and you have balanced the boat.
Now I have never driven in a DD before, but I can tell you this. That my 20V will out maneuver any IO at speeds over 20mph. Now when it comes to speeds below 10mph, I have to bow down to them. ( but does anybody drive that slow anyway)