My 23 has a top speed of approx 39mph (+/- 2mph with load/conditions) . . . 38.6 isn't too much of a loss. The conditions usually dictate your cruising speed anyways, so 95% of the time that is enough speed. The Merc 150 3.0L has almost as much displacement as the first generation yamaha 4 strokes 200 - 250hp (3.3L) and Honda 225/250hp (3.5L). It's only 4 cylinders, but it sure seems like it'll do the job.
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