Engine Trouble

How high do your risers stick up above the logs of your manifolds? Are the manifolds leaking? External corrosion doesn't necessarily mean that your engine is done. Yes,...you can use an automotive engine "block" if that's all you need. That's the bare block not the short block assembly. There's no difference in bare blocks between automotive, marine or truck,...they are all the same. The assemblies are different though. There's another thread here that deals with the differences. Look up Discount Inboard Marine or call for your type manifold. Those guys are very helpful. You can also do a search on line and find them cheaper. Osco makes a good replacement. Head gaskets are no problem to replace if you have mechanical experience and basic tools (and a torque wrench). How many hours does your engine have on it? Do you have any specific questions? Write back if you do.