Shelby GT350 R
Produced in just 1965 and sold to privateers and racing teams all over America and the world, the Shelby GT 350 R was a pure racing beast. They were not street-legal and were used only for racing, which they did exceptionally well (via Robb Report).
The R version was powered by the same 289 V8 as the regular Shelby GT350 but had nearly 400 hp and numerous racing modifications. The car proved extremely fast, winning races in America, Europe, and South America. Only 34 were made, so you’ll need a fortune to own one today.