Well, hang in there and I'm sure you'll get them all ID'd. Again, unless you find someone locally who can start them, run them and determine what's been done or needs to be done, it's a tough call.
Without any knowledge of the workings of a nitro rig it's almost impossible to put a value on it. That would be based on what upgrades have been added and the condition of the engine itself. They are all worth something, but none of them would be considered "Valuable" since you never get back...