sentences:  Monaco and (less so) Jarama were slow circuits where aerodynamic downforce was not as important as mechanical grip, so combined with Villeneuve's famed ability behind the wheel the car was able to perform better than expected at these two races.The arrival of Harvey Postlethwaite led to a total overhaul of the car in time for the season.The turbo engine was further developed and reliability found, while an all-new chassis and bodywork were designed, featuring Ferrari's first genuine full monocoque chassis with honeycomb aluminum panels for the structure, which made it more similar to its British specialist competitors' cars than the previous year's car had been.