late model v-8 motor change

[spareparts]

Couple of other things for you to know about if you haven't allready figured it out. If that new motor was a fuel injected engine, it may not have a mechanical fuel pump boss, some did, some didn't, some had the boss, but didn't have the holes drilled for mounting and for the push rod to go thru. If you new motor doesn't have provosions for a mechanical pump, you can use a Marine Rated low pressure electric pump. Second, if you didn't allready know, the intake manifold bolt pattern is different, the center bolts come in at a different angle, you can open up the holes in your existing manifold and make some angled spacers out of 3/8 id pipe, its doable without a whole lot of work, but just be for warned. Also, while you have the new motor hanging on an engine stand, replace all the freeze plugs with brass ones, if you don't you will be replacing them before long after you put the engine in, the steel ones just don't last in a boat. If it were me, I'd pull the timing cover and replace the timing chain with a good high quality chain, the factory GM chain that comes in boat motors is excellent for the money, a Cloyes is a good aftermarket chain. Your motor may have coem with the factroy plastic gear set up, it will not last in a boat.