Volvo Penta used the crank mounted pumps on the SBCs for years. Marine Power as well. I have had them and was pretty happy even though it took me a bit to trust it. The way they use a rubber bushing around the arm bolt takes up a lot of flex/vibration. You can change the impeller pretty easily and if you have it set up with shutoff valves, you can do that in the water. My only concern would be getting enough cooling since it looks like you will end up with a pretty high performance motor.
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