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..Just make sure it was a fresh water cooled block..It ran antifreez thru the block..Raw water cooled engines were cooled by sea water.Mine was reverse rotation engine..But I used my stock crank and new pistons..cam etc.

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I've been in boats my whole life, and have had 2 different marine engines (413 Chrysler and v-6 Buick) rust through cylinder walls after years of use in salt water.

If yours used a closed cooling system (similar to a radiator in a car) or it was used exclusively in fresh water with an open system, then you should be good to go.

If reverse rotation, then the only difference is the knurl on the rear main surface on your crank being machined in the opposite direction. If you try to use it as a standard rotaion crank you'll have oil leaks.