Very cool. Not likely to be original but still cool, like RedTele58 said probably a Beck recreation~ He makes cool cars, my boss just built a transmission for him for his latest 904 replica. Got to drive one of his 904 replicas with a 993 motor in it a few years back too, fun car!
He was here at the shop a few weeks ago when I pulled up in the V8 Boxster and he was like "sounds like you are missing a few cylinders there"... I just explained that it was just the big cam on the LS3 V8, that got his attention