So I recently blew up my old CAT 3208 despite its extremely low hours in my 31' BHM. With the lobsters just now hitting I need a quick turn around, and everyone with a re-manned 3208 thinks they're made of gold. So I have made the decision to do a total re-power with a new CAT C7.1 in the 400 HP model. I'm running a twin Disc 506, and currently have a 28x26 prop and 2" shaft, that with the old 355HP 3208 provided a lackluster 11 knot comfortable cruise and WOT of about 14 with the wheel cage on. I assume with the new engine 50 more HP but the same gear and prop I will not see a great increase in speed, but should be able to get a new prop (when funds permit, Engines ain't cheap) and see a few more knots. What do I need to optimize efficiency/speed? Thoughs?