Thinking more about Tracker's original question/intention...why don't we have a page here listing found/known/spotted 'possibly original' engines/trannys/build sheets that have gone astray from their cars...don't some Mopar and 'Vette sites do this?.
No question there'd have to be disclaimers on the pages also we'd have to put up w/ the odd shuckster trying to legitimize restamps or whatever other games may result...but overall it seems there's a good chance we could get a few genuine original lumps back between the rails they were delivered in?.
And I'm not suggesting we post pics of what's been found, maybe not even the engine stamping date, suffix, castings etc...perhaps only the Vin of the item and last known location and let the owner of the Vin be responsible for authentication and further info?.
We all see them at swaps, on eBay and elsewhere...ChucKing could perhaps fill a few pages himself?.
What's anybody else think...and is this something the site would even consider?.

~ Pete