"We have a 1987 2550 Bayliner (25'5") beam 9'6". It has a Volvo DPXS-xact, but don't know the age or gear ratio. It has a 350 chevy V8 small block, which we think is 285hp. we are told these two units are not compatible as the duoprop size is straining the motor. We have just done the bearings...