It's the engine from this little beauty. Don't know anything about it really other than it's never been featured. It's owned by a VXLSCC guy, used to be an N/A V6. He keeps a low profile with it and can't recall even seeing a spec sheet for it.
Lovely car though.
Incidently, the young Haynzee mentioned to me that you were after a V6 cover....I do have a spare one somewhere.