The Longchamp was derived from the De Tomaso Deauville four-door saloon, using a shorter wheelbase chassis with the same suspension, engine and transmission.

The Longchamp featured a long and wide hood to accommodate the American power train, i.e. the 351 cubic inch (5,769 cc) Ford Cleveland V8.

It was rated at a power output of 335 PS (246 kW; 330 hp) and gave the Longchamp an official top speed of 240 km/h (149 mph).

[2] and minor suspension setting differences to better utilise the wider Campagnolo wheels with Pirelli P7 tyres.

After supplies of American-built 351 V8s dried up, De Tomaso began sourcing their engines from Australia, to where the production line had been transferred.

This was the top-of-the-line version, fitted with twin round headlights and extra spoilers, skirts, and a rear wing.

The Longchamp was never officially sold in the United States, although a number of cars found their way into the US as gray-market imports.