4.3L engines are fine with alpha's. As for impeller change, it should be done every year. If you had a Bravo and changing the impeller was a pain, its not Merc's fault. Just a poor boat design. I've seen Baja's where the impeller was behind a stringer and removing the impeller was impossible, I had to lift the engine up with a hoist to swap out the impeller. NoBozo is right on the money with HP and the cut off for the drives.
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