My opinion, buy a jdm engine. You can have them shipped to your door for less than 600. They have 30-60k on them. If the engine starts burning oil or what have you then have it swapped in.
With proper maintenence that 60k mile engine should last 300k miles or more.
I've swapped a 250k mile z1 into my 285k mile chassis without hesitation.
Like frank said I wouldn't touch anything but it is nice to have your backup plan.
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Burn lean and prosper \\ //
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