I got to test my new boat this weekend, YES! Boat ran good for stock 454 about 60 mph turning around 5800-5900 RPM! Well you know when I got back home out comes the stocker in goes the bigger motor! I know the increase in HP is going to probley need an impellor change I am running an A right now. The increase in HP will be around 660 double the 330 I pulled out! What would anyone suggest? I use the boat for fun not racing But, it will be tested!