Diesel Speed Boat What Engines For This Boat?

What engines for this boat? - diesel speed boat

I have an old wooden boat (open) by 37 meters long and 10.5 wide, I want a diesel in and said if possible to a speed of about 12-15 knots, you must get a diesel engine, it presnt Weigner in about 4 tons, the time I build a house and the government left open before finsh back about 12-15 feet, I think we will do in about 6 tons. So! this speed is reached by boat, so
or am I at 5-7 knots, which is what I believe was originally built for the plug, but no energy in 1938 than we have now. Any help would be appreciated, as I nowt on feeding vessels at the time which has the property know of a single screw shaft.