The silver car looks little more than a modified road car. The FIA Group 2 rules these cars raced under allowed a huge number of freedoms, which most teams pushed to the limit.
The orange car has quite curious fender treatment which me reminds me of the Jon Ward Camaro/Firebird raced briefly by Jerry Titus. Also note the incorrect stripes which run across the roof.
The two Camaros were raced by Robert Eberhard and Cox Kocher/Georges Kolb and were a long way from being competitive.
The most competitive of the V8s was the green 2nd gen Camaro of Ivo Grauls which Jon mentioned above. This car was very fast, and claimed several pole positions at various events throughout 1971 and early 1972 before Grauls was killed in the car in an incident at Chimay in Belgium.
