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if you're smart,you're gonna replace the engine with a complete new engine...
manifolds and risers-5yrs max-flushing has no bearing here.
trust me,the advice i gave is the best...
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I agree with everything here but the issue of flushing. Flushing your engine can save your from early failure, but failure will still come. Regular motor flushing can extend manifold life to 7 years IF it is done without the motor ever cooling with salt water still in the manifolds.
the problem is many/most people shut the motor down while drifting or anchored, or fail to flush after use until they trailer the boat home, allowing the motor to cool and then reheat with high quantities of sodium still in the manifold.
Replace the motor if you plan on keeping the boat for more than two more years. Replace the motor with a closed cooling system and heat exchanger, and STILL change the manifolds and risers every 5-7 years.
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Frank, read his first post carefully.
He has the partial closed cooling system which means that his engine/block is fresh water cooled only however the manifolds/risers are not. That being said I would see what I had before I just spent a lot of $$$ on a new engine. What normally kills a inboard or I/O is most of them are completely raw water cooled and the salt eats up the block/heads etc. Another option would be to get a new long block from GM and install his marine cam and acc. from his other engine, being a 1999 it should be a roller cam, which is nothing wrong with re-using provided it looks good.