1. Too many unknown variables to give an accurate answer..."around" 50's ish + or - I would guess

2. A 22 Raker...they come with a 13 or 15 spline hub. I am pretty sure the gearcase on 150 HP and up is 15 spline and 115 HP or lower is 13 spline. Count the splines on your current hub. I would bet it is a 13 spline.