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Welcome aboard…..from Central Florida.
You are on the right track horsepower-wise but the charging capability of the older engines is dismal at best.
Since the battery will probably be used for other duties as well as a cranking battery you may want to install a VSR between whatever "house" load the battery will supply and the battery.
A VSR is simply a voltage sensitive relay that will kick the battery off-line to the "house" at a voltage high enough to still allow the battery to start the engine. Blue Seas makes a good, cost effective one.
Secondly, the engine will only supply a couple amps at most at slower to mid-range cruise RPM and since you are doubling the required horsepower to the boat that is probably where the engine will see most of it’s service life……so be prepared.
Sounds like a nice project you have there and good luck with it.