There is an old guy near me that melts down old Turbo 350 transmission cases and makes them into repro speed shop license tags. The only speed shop in town when I was a kid was called Eddie Joyners Speed Equipment, and they had cast aluminum tags for the front of cars. They went out of business in the late 70's. John makes the tags with sand castings that he makes from an original tag. He hasn't made a run of them in a while, and I have my name on the list to get one when he does. If you want to see something cool....look on You Tube and find the video of the dude that pours molten aluminum down and ant hill, and then digs it out. I can't remember the name of it, but it's easy to find.