The suspension on the 1955 Chevy is progressing well. New control arm cross shafts with 2 degrees of caster to help these old manual steering cars. They would use negative caster to help the cars turn at slow speed, but this makes them unstable at our highway speeds. So dialing in positive caster really helps the highway speed stability. Makes the cars much more comfortable at 70 mph. Of course new ball joints, shocks and new sway bars keep the wheels planted and under control.
Rack and Pinion kit fits into the stock steering box and idler mounting holes. This is a nice upgrade for these cars when the entire steering system would need to be overhauled. If your car already has decent idler, centerlink and tie rods then updating the steering box to a 605 style is a nice way to go. This car would have needed everything replaced, so a R&P kit is a good choice.