I have a 1985 Baja Force 200 with a mercruiser 260 with a alpha1 lower unit. The boat weight is 2800#. I have a 1.84:1 lower and I was wondering if this is correct for this boat.It runs at 50 mph at 4300 rpm with a 19 pitch prop. I know this outdrive has been replaced but I don't know if its...