Better pictures of one...
http://www.conceptcarz.com/vehicle/z2046/Chevrolet-Corvette-Tempest.aspx
Apparently it is a 'Vette that was tuned by a company named Le Marquis. So far, i have been unable to turn up any information on the tuner, and they may have closed. I would equate this to something like AMG, where they, before MB bought them, were the tuners of special MB cars.
As far as current value, I would contact a Chevrolet dealer and find out if they know much about them
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1987 560SL
85,000 miles
Meet on the level, leave on the square. Great words to live by
Were we directed from Washington when to sow and when to reap, we should soon want bread. - Thomas Jefferson: Autobiography, 1821.