After starting 32nd Rathmann was the fastest car on the track in the 1957 500. And he was leading after the halfway point when the handling suddenly went away. It turned out that a frame weld had broken but as you stated he still held on to finish second. The Salih laydown led something of a charmed life in both 1957 and 1958 in winning the 500. It was probably only a top five car by 1958 at best had it not been for the first lap crash taking out several better cars. In fact, the whole laydown concept was never really much of an advantage at all and only Johnny Thomson was ever able to win another Championship race in one. The laydowns were a great story for a few years but the truth is that you were always probably better off in a Watson roadster with a strong upright Offy.