At Opentracker racing, we believe the Chevrolet Nova should have came from the factory with a roller spring perch.
Our spring perches use a custom made chromoly shaft and sealed roller bearings as the pivot point instead of a rubber bushing. This upgrade provides a huge improvement in ride quality, responsiveness to the road, stability under braking and handling. The stock rubber bushing greatly increases the effort required for the suspension to move.
The reasons why a roller product improves how a classic drives is why we do what we do. Removing bind from the suspension pivot points is a huge gain to any performance driven vehicle.