Looks interesting. I'd be interested in reading about how well it installs and drives. After driving modern cars with PS, the factory C3 PS steering is annoying to me. My 68 C3 stock PS has absolutely no road feedback. It turns so easily at speed, it feels like the steering wheel is not connected to anything. This becomes a problem since I have mistakenly installed too stiff of a suspension in my 68. (VBP Street and Strip suspension) On a bumpy road, my body bounces around in the car, and body motion translates into steering wheel motions due to my hand on the steering wheel!
If the rack and pinion is a straight bolt on and provides modern feedback it'd be something to seriously think about. Getting rid of the stock factory control valve and power ram would be an advantage. These things are prone to leak and the remanufactured replacements have a reputation of being unreliable. (Although the remanufactured replacements on my 68 are holding up OK.)