prototype

I cam across a 1994 or 95 Mustang 4.6 Liter Engine and Transmission Drop out that is stamped prototype all over it. The guy said they only made 3 of them and I haven't been able to find anything on the internet about this motor. Does anyone know anything about this?

Johnny Sparks and I had a few days to join in on the Hot Rod Power Tour in Detroit down to Champaign Ill. with his Reversion Mustang, A great event! just wish we had time to run the full Tour! maybe next year. Here are a few pictures of the Reversion Mustang as we made a few other stops at...