The big CCPs were designed for twins weighing around 400 lbs each. How much flotation does the Armstrong bracket provide? You can do the math, but take the weight of your new engines and subtract the floation from the bracket, and that give you about the net on the back of the boat.
I would guess that the console can stay where it is, but I would move batteries up under the front of the console, and not put a big baitwell all the way to the stern... Just my $.02...