holdfast, putting in a physicaly larger engine can lead to maintainance problems if it crowds the engine room. Things(filters, pumps etc) get more difficult to access if it is crowdwd. Also changing to a differant engine will be more expensive than just the engine cost, since engine beds, couplings, maybe the shaft ,may or may not need to be changed. I dont know if the W40 was based on one of the common tractor engines or not , but getting an engine that will fit in the existing engine bed
will save dollars. You really dont need more power for long distance cruising, you need reliability
,ease of maintainance, and econemy. Spend the extra dollars on a MAX prop or folding prop and it will make for better passages. My 2 cents worth.____Grant.