Darrel, when I installed the Toyota power steering box on my '56 M100 I was loaned a manual Toyota box to use for mocking up while I waited for a power box. Other than the power component they are identical in configuration. You will not be able to use the Ford horn wire without some modification. There is a kit available that will allow you to feed the horn wire (using a special set of contacts on the column and drilling a hole in the side of the steering shaft) up through the shaft to the horn button. I will see if I can find the link. I fabricated my own horn contacts using a pair of copper plates under the steering wheel.
Darrel here is a link - there may be others - but you will need a loan at the bank.
http://blundellspeed.com/product_horn_saver.html