Other then standard annual maintanance I have been running my 1974 X 18 virtually unchanged for the past 23 year. This winter I have tweaked the small block 350 to 300 hp. The outdrive is a 270 VP. First I am curious to know the weight of this boat because it feel much more heavy then my buddy's 1989 18 ft classic which is 2700 lbs. Secondly I still have the original bronze prop on the outdrive and I know that prop selection is a matter of "try and see" but can someone help start me in the right direction prop wise?