There is a difference between the ss 350 (L48/M20) and the L30/M20 as to the location of where the speedometer cable exits the firewall. The ss 350 had a muncie 4 speed where the L30/M20 had a saginaw 4 speed. On the muncie equipped cars, the speedometer comes through the firewall between the steering column and the transmission tunnel. On an L30/M20, the speedometer cable will go through the firewall on the other side of the steering column.
