It depends on the boat and what type of engine is already in the boat. If it already has a 305 Chevy, it's a direct bolt in. If you are replacing a Ford engine, more work is involved simply because the two engines are completely different from each other. Motor mounts, exhaust manifolds, and several other things would have to be changed. Most marine bellhousings (for inboard/outboard drive units) have bolt patterns for both, so that part would probably be fine as is. If the boat isn't set up for an inboard engine, the work is far more extensive than I can explain here. While you are at it, you better make sure the 350 won't be too heavy, which would depend on the size and type of the boat itself.
Freeze plugs
key
Yes. You may need to make other changes, such as different flexplate, different driveshaft, or possibly different transmission mount. But it will work.
Need more info: Thank you.
yes, but the main journals will need to be turned down to fit the 350 saddles
What do you need to know about it.
Need to know the year of engine, and what it is in. NEUTZ.
Many Chevy motors will interchange, need to know what you have in mind.
As long as the 350 is a fuel injected engine / TBI / Throttle Body Injection engine there is NO difference.
The frame engine mounts need to be moved and the headers need to swaed with the 350.
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no