It's not a race engine, right? I'd do as Jerry said in post #2 and see how it does.

How many engines sit idle for ten, twenty, thirty years or more and once shown to be free to rotate start and run just fine? Think of some of the barn finds brought back to life. I have a brand new ZZ4 sitting in the barn, sold in 2009, and it's not coming apart before it fires. Granted that's only six years at this point....