I'm going to go look at a Mustang this weekend with a factory s code 390 in it. The guy says the engine turns over but doesn't run well so it probably needs rebuilt. I would like to know what's the best way to store the engine while I'm restoring the car? Would it be best to leave it assembled or would I be better off tearing it down and leaving the bare block? I've got all the stuff to do either one I'd just like to know what is better so in a year or two when I'm ready to have it machined I'm not fighting it to unlock it or having a ton of rust on the inside.