I agree a good, workable solution can be found. Maybe part of the decision was rpm/vibration based. The old nemesis tip speed may be involved. In any case, the prop shops are still beating props into shape on the same dies they used decades ago. What worked then will certainly work now, and may be hard to improve on.
Shaft diameter also enters into the equation, as to torque and thrust limitations. Higher rpms, less torque, same thrust.
I also believe the characteristics between the 427 and the 454 are similar, with the 454 maybe a little bit stronger. Both engines are happy at 3000 rpms. and peak out at 4200 or so. Even with a big ol' square cam they aren't gonna make much high rpm power..the exhaust is simply too restrictive.
Personally, I plan on using a down angle transmission in my 31'. Won't help performance, but the engine oil/carb floats will at least sit level.
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