1964 Mercury Monterey power steering problem

I have owned 64 Mercury Monterey since new. Power steering control valve was leaking. I replaced the original, control valve, power cylinder, pump and hoses with new parts. I bled system and now I do not have power steering at low speed as in when trying to park the car. Parts store exchanged new parts thinking one may hjave been defective and still same problem except this time the control valve leaked all the fluid from the cap that covers the spool adjusting nut. I don’t know what to do??

Are you sure that the belt was tight? If the control valve cap leaks inspect the gasket.

Thank you Rod, I rechecked the belt. I walked away from it for a couple of days rather than work while frustrated, on Tuesday I plan to pull the cap off the control valve, remove the spring and spool and check the seals.