I have a 1988 Wellcraft 192 Classic, 4.3L 175hp with an rpm range of 4200-4600 OMC sterndrive with ratio of 1.68, 2400lbs 25 gallons fuel and is a 19ft length, beam is 77" the dead rise is 18? and is a cuddy cabin. When I bought it in 2005 it had a aluminum OMC prop #391202 21p that took a...