Thought this was an interesting find on CL. It is an Alpina built 1993 M50 and the owner is claiming 250hp. I think that this guy is smoking his socks because he is asking $3400 for the engine but hey maybe there is someone out there who is looking for that exact thing and willing to spend that kind of money on a used race car engine...
http://daytona.craigslist.org/pts/4266808370.html