I know a guy that has one of the Packard blueprint copies (built for a P-51 mustang but his was never in a plane) of the Merlin. He's also got a left-hand Allison V-1710 out of a P-38. He talks about putting one or the other in a car but I doubt he ever will. I think the Allison turns the wrong way anyway if I'm not mistaken. He does drive a '51 Merc with a 427 Nascar engine though.