Hi, I have a 2950 Avanti Bayliner, its weight is 7400lbs. It has just been repowered by a pair of Vortec 315hp SBC, their driving OMC Cobra Outdrives with the 5.0lt Gears 21:18 (or for you Mercruiser Enthusiasts it has a ratio of ap. 1.59:1) <br />Do you think that I should 3, 4, 5, blade props...