 The Echidnas were three Devin-bodied specials built by Ed Grierson, Bill Larson, and John Staver.The Echidnas were built on shortened, narrowed 1956 Chevrolet passenger-car frames with custom cross-bracing.Front suspension was independent using many stock Chevrolet sedan and Corvette parts including coil-springs, links, a-arms and, at least initially, steering boxes.