Yo . . . nice work, but why are you spending 20K on a motor!!!
For 12K you can get a brand new 30" suzuki 250 from eds. That motor is perfect for your boat. 2mph difference on the top end and .5mpg better cruise is hardly worth 8K . . . also 30" shaft would keep the powerhead higher up out of the slop in the rips at quicks.
http://www.edsmarinesuperstore.com/suzuki_outboards.htm
8k = 2/3 of another suzuki 250 or a sweet radar, fishfinder, GPS . . . and 5k in the bank . . . or a full two seasons of fuel (with that motor).
Just looking out for yah!!