Bizzarrini figured there would also be a demand for a race version of the Grifo and developed the A3/C (C for Corsa) with a dramatic, modified alloy body by Drogo .
He later dubbed it his “Improved GTO", as he designed the 250 GTO when he had worked for Ferrari. In the Corsa, he moved the engine back about 40 mm (1.6 in), making the A3/C a front, mid-engine car. To adjust the timing, mechanics had to remove a piece of the dashboard.[8] Both the racing and road legal versions of the car were being built simultaneously. When leaving the factory, the Iso Grifo was originally fitted with Pirelli Cinturato 205VR15 tyres (CN72).

At the Turin Motor Show that same year, Bertone showed the Grifo A3/L prototype while Iso unveiled the unpainted competition version: the Iso Grifo A3/C. Both became successful in their own right, the road car receiving praise from the press, while the race car performed very well although it had been made on a much tighter budget compared to Ferrari.
Drogo...
Carrozzeria Sports Cars was a carrozzeria in Modena, Italy, founded by one-time Formula One driver, Piero Drogo.

Piero was born in Northern Italy in Vignale Monferrato, a small town near the city of Alessandria in Piedmont on August 8th, 1926. His family immigrated to Venezuela and Drogo began racing in Venezuela in the 1950s. He raced extensively across the South American continent in sports cars and in the road races.
In 1958 he returned to Europe to compete in the 24 Hours of Le Mans and stayed on, setting up home near Modena. He ended his motor racing career in 1960 with eighth place in the Grand Prix of Italy driving a Cooper T43. In that period he found a job as a mechanic at Stanguellini in Modena.

In 1960 he established Carrozzeria Sports Cars in Modena together with Otello Benedetti, Mario Allegretti and Lino Marchesini. The company was also referred to as "Sports Cars di Benedetti & C." (1963 to 1969). The most prominent of them was Piero Drogo, as he spoke several languages, was an able businessman and was well introduced into the world of motor racing. He quickly began taking on small sports car and racing body orders from the manufacturers in that city. He had two well-known craftsman, Neri and Bonaccini, repair and rebody a wide number of Ferraris, some crashed, some with an owner who just wanted "something different".

Piero Drogo's designs are highly esteemed: he captured the extremes of the era, taking a fashionable style and doing it to the max, almost to exaggeration, with clever application of aerodynamics knowledge of his time. In effect, all of the Carrozzeria's creations featured rather personal lines, partially to content the tastes of those who commissioned them and partly to create a distinctive style for the marque.
The prevalent activity of the company was however aimed at racing drivers and teams which, after an accident or due to a passing fancy, wanted to give a new look to their cars. Most of the transformations were therefore for motor racing, but there were also specials for road use. And then there were the so-called 'boulevard racers', which looked like racing cars, but with the real purpose of impressing people on the roads of fashionable areas.
In a later stage Piero Drogo, together with his designer, Tardini, pioneered with angular lines and came in for much criticism from the press for their harsh aspect. History proved however that he was right, with the appearance of the Lamborghini Espada, Maserati Ghibli, Citroën SM, Ferrari Daytona and so on, of the ‘seventies.

Drogo's bodies were used by Scuderia Serenissima and Bizzarrini, and his work for Ferrari brought him much fame. Especially the Ferraris Dino 206 SP, 330 P4 and 250 GT SWB 'Breadvan' are valuable masterpieces. The particularity of Carrozzeria Sports Cars was that it obtained the permission to also use the Prancing Horse by Ferrari.

The company was shut down in 1971. On the 28th of April 1973 Piero Drogo lost his life when his Ferrari crashed into a lorry in the Allocco tunnel near Bologna as he was returning to Modena after a party.