My experience comes from a 1972 Nova, so might not be directly applicable however our subframes are very similar. I can only get about 25* of steering angle measured at the spindle with my 12.7:1 (2.5 turns lock-to-lock) steering box and factory quick-ratio short steering arms and long pitman and idler arms. This steering angle is with the steering stops removed from my Speedtech arms, so is the mechanical range of the steering box. This leads to a lot of 3-pt turns for sure. Long story short.. I've never been aware of these 1st gen subframe factory suspension/steering design being very good at steering angle and thus turning radius.
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