Going from power to manual steering
I just went from manual to power steering on my 68 Barracuda and it's one of the most satisfing upgrades I have made to the car. No more feeling like I am steering the Queen Mary in parking lots and the 16:1 ratio makes the car respond like a new car at speed.
I had heard all the complaints about lack of feel and to much assit with power so I had the local front end shop (a place that does a lot of hot rod work) do an alignment with as much caster as they could, requires more effort to turn the wheels off straight ahead. The steering is still quite light but it is not bad and is way better than the manual steering I had. In 20-20 hind site I should have gotten a Firm Feel box instead of a rebuilt factory box but I will never go back to manual.
Before going through the trouble to swap the steering why not find an alignment shop that is capable of working with you and give it another try.