 Complete the following phrase:  Both Iso Rivolta and Marlboro left before the 1974 season, leaving Williams with ficial problems. The two IR chassis were retained, now re-designated the FW after Frank Williams, but initially only a single car was entered for Arturo Merzario, who had replaced Ganley as the teams number one driver. There was an early-season boost as Merzario placed sixth in the third race of the season in South Africa, but when the second car was reintroduced, the string of paydrivers employed to drive it produced little in the way of results. After three non-qualifications, Jacques Laffite was brought in to partner Merzario and performances gradually improved, culminating in a fourth-place finish for Merzario in 