C&C Motorsports in Manassas, VA. has the real deal.
http://www.candcmotorsports.com/index.html
Carrol Carter has his own block and heads and builds these motors for Pro Stock as well as "street" applications. He built my FE and is reknowned for his expertise on these motors. When I picked up my motor there was a guy in VA. who had one in his Cobra. I think it was a "monster" motor. Carrol advised me not to even think about it as it was totally undriveable on the street in the configuration the fella had it built in.
If one was reasonable I'm sure a streetable one could be configured.
These cars are a handful now....
David