Original sentence: Externally, the styling was more rounded and the tailfins were lost.In 1964 the Vanden Plas Princess 4-litre R was introduced.It was launched at the London Motor Show.Styling was similar but the wheelbase was longer
Edited sentence: Externally, the styling was more rounded and the tailfins replaced by small corner-ridges.In August 1964 the Vanden Plas Princess 4-litre R was announced.Options now included "Smith's air-conditioning".Styling was similar but the wheelbase was two inches (5 cm) longer and anti-roll bars were added to the suspension at both ends of the car.The 3,909 cc over-square Rolls-Royce engine was a short-stroke version of a Rolls-Royce engine used for certain military vehicles, and boosted claimed power output to 175 bhp "gross" which provided a considerable performance increase, accompanied by wider tires, a much higher final drive ratio and the standard inclusion of the US built Borg-Warner Model 8 Automatic transmission.The Princess R was presented at the London Motor Show in October 1964