I need to replace my existing Whisperflo 3/4 HP motor. It has an AO Centurion motor. The pump basket is in very good condition. I'd like to go to a 2 speed AO Smith Square Flange Pool Motor - E Plus Centurion - High Efficiency - .75/.1 HP - 230 Volts - Stock Number B2980. Would this motor directly bolt into the existing basket and could it use the existing impeller? Any problems with such an installation? Would the 2 speed switch be on the motor itself (I'm aware it doesnt come with one) or does it mount somewhere else? Thanks for any help!