another thought - 60 amps is REALLY high for just a 20hp motor. You may be nearly killing the engine trying to recharge your batteries. If you were caught with your pants down in an emergency and needed full throttle, that alternator would likely make the engine bog down bad.
I would suggest going to a mitsubishi 20-25 amp with built in regulator to reduce the parasitic horsepower loss when your bateries are low. Anything should bolt and wire in as long as the hinge bolt and pattern matches your old delco. (replacement is only about $40 at autozone).
I reject your reality and substitute my own.
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