I think that the showcar does have the crossflow engine. I can remember some press clippings that I've seen about the car. I think they are in the racing section of this forum
Some general information about the "black shadow".
The Swiss Lotus importer also made two special versions fitted with the Renault 16 TS type 807 engine, the "Europa Hemi 807" and the fuel injected "Europa Black Shadow 807". The Hemi 807 had 105 PS (77 kW) SAE and could reach 200 km/h (124 mph), while the Black Shadow had 137 PS (101 kW) on tap. The Black Shadow also received a five-speed gearbox.[4] These cars had a wider track, special wheels and stickers, white indicator lights up front, and featured extractor vents high on the side panel behind the rear door. The fuel injection system was from Kugelfischer.
The link to the thread with the specs is here:
http://www.lotuseuropa.org/LotusForum/index.php?topic=65.105Serge