O/B CONVERSION,WEIGHT DISTRIBUTION

I AM IN THE MIDDLE OF A CONVERION FROM 470 I/O TO AN OUTBOARD WITH A BRACKET. THE SIXTY GALLON FUEL TANK IS BETWEEN THE PEDESTAL SEATS. WILL I NEED TO MOVE WEIGHT BACK SO I DONT ROLL THIS BOAT IN A FOLLOWING SEA ? WHAT DO YOU GUYS THINK? I PLAN ON POWERING WITH A 150 CARB YAMAHA.