That's a Firm Feel Stage 3 power steering box being installed. Stage 3 is the least assisted power steering box, for a more firm steering wheel. It requires slightly more effort to turn than the factory steering box, which most people would say is a good thing. Chrysler factory power steering was over assisted, making it easy to overcorrect in a turn.
Steering firmness is also affected by front tire width (scrub), and steering wheel diameter (leverage). It would also be affected by a fast ratio pitman arm (leverage).
Stage 3 is nowhere near being overly firm in my 70 'Cuda, and I expect it to perform nicely in this 70 Road Runner also.
