In my opinion, because the engine does not have a partial vin stamped on the pad along with the suffix code anyone who has a 69 built in Late January thru the the 3rd week of March 69 could buy this engine and post it as at the very least numbers matching if not original. They could have the partial vin stamped on the pad which isn't illegal but frowned upon. Price is also set by supply and demand as I have stated in other posts. If someone is willing to pay $6500 for the engine more power to you. I just don't see myself paying that kind of money for a engine that needs to be rebuilt. One of my biggest concerns is that we are pricing ourselves right out of saving these first gen muscle cars.
Again this is just my opinion and not meant to besmirch what you are doing.