Would you not be better off looking for a RR Merlin or Griffon, or even a Liberty? I don't think they made more than a few hundred Lions, whereas there were thousands of Merlins, Griffons, and Libertys churned out. Hell, I seem to remember reading that you can buy a shiny new Merlin if you've got deep enough pockets. Or is this in the cause of originality? Bonkers. Good luck.