If roller spring perches are so good why didn Ford build them that way?
Ford’s original spring perch design, in the early 60’s, utilized free rotating brass bushings. Ford changed to rubber to cut costs and reduce regular greasing and maintenance. At the time the rubber seemed like a very economic solution. It is also quite common for the best performance parts for both the daily driver and the circle track champion to be designed in the aftermarket sector rather than by the original manufacture.