if its not badly rusted you can convert many but not all, chevy marine engines to automotive use,marine engines rarely wear out from use the salt water erodes the coolant passages and eats gasket surfaces over time as the engine sit idle, even when not in use.
balancers and accessory pullies will need to be found as these likely won,t work on a car.
keep in mind that some marine engines are REVERSE rotation used on DUAL INBOARD applications, most will have cams, and intake manifolds, designed for max torque at about 4500 rpm,168 tooth cast flywheels,that have no clutch and are likely to be badly rusted and need to be resurfaced and no pilot bearings in the crank shaft rear,the water pump MUST be replaced with an automotive style, a few will have odd starters and none of the bell housings will fit a car application, most marine engines use an oil pan that won,t fit a car, and dipsticks that fit into the useless (for a car oil pan), motor mounts generally won,t interchange and in some cases the mounting bolt holes will be badly rusted in the block,
many of the ones youll see will be the newer one piece rear seal and vortec head versions, you won,t find many marine engines worth rebuilding over about 10 years old, simply due to corrosion.
shop carefully and don,t jump on the first "DEAL" you find I've used BLOCKS &, cranks and rotating assembly if it was well maintained AFTER a careful inspection and detailed clean-up, from marine engines several times but I generally fill the dumpster with the oil pans, heads etc
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