Overall, geometry of a 70 Cuda front suspension is much better than that of a 69 Camaro. The Cuda can be improved on to make it even better. It may never be as precise as a new car, but it certainly can be better than what you recall.

The rear steer layout of a Mopar doesn't really lend itself well to R&P set ups. It creates more compromises than its worth for simply improved feel. Get a better box for improved feel, step up the rest of the system to Firm Feel or Hotchkis specs, and leave it at that.