Looks like you have a 351 that would come stock with this boat.
The length of time since it has last been run determines how best to deal with it. If its more than a 6 - 8 months, fresh fluids, filters (don't forget fuel filter) & plugs and you are ready to fire up.
If longer than that, I would pull the spark plugs and pour an ounce of motor oil into each plug hole. Then get a large 1/2" ratchet and the appropriate socket on the crankshaft pulley and manually turn the engine over a few times. Then change fluids and filters and screw in the new plugs.
Make sure you are supplying water to the engine while running, but DO NOT TURN ON THE WATER UNTIL THE ENGINE IS RUNNING. If you turn on the water before you fire her up, you will end up with the water pressure backing up through the exhaust and through partially open exhaust valves and into the oil pan. Getting that oil and water mixed together out of the oil pan is a pain in the a$$.
S5 WHEEL PACKAGE - FREE SHIPPING
TWO WHEELS W/ST205/75R14 KENDA TIRES $299
TANDEM AXLE PACKAGE W/205/75R14 KENDA TIRES $599
TWO 5 LUG WHEELS W/ST205/75R15 LRD KENDA TIRES $349 S5 W/BLACK INLAY
TWO 6 LUG WHEELS W/ST225/75R15 LRD KENDA TIRES $359 S5 W/BLACK INLAY
$99 LED LIGHT PACKAGE - FREE SHIPPING
REBUILDING HOLLEY MARINE CARBURETORS - $235 DELIVERED
Email - firstname.lastname@example.org