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The engine will last as long as it would stock...
That is assumming you upgrade the valvetrain with better springs and pushrods. I would also address the timing chain while you are in there. If you do that, I would say it should last as long as it would if it were stock, and taking into account your driving habits.
That being said... If you drive on the highway all day it will last longer than if you hit the track every weekend whether it is stock or slightly modded.
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