This is actually a good question about peak torque. I think one would have to look into unlimited hydroplane racing or tractor pulling for the Allison V-12 for example. They have to tune those things somehow. Why not on some kind of Dynamometer? I'm not aware of any ground/water sport using any...
I had the idea of using a more powerful engine/prop combination and flat-rate it to a higher cruise speed. I've just started researching aircraft V speeds and found I needed a place to start when comparing designs. Picture a XP-51 (491mph max) with a turbo-prop that could generate 2300...