If you want to do the Toyota swap, a popular power steering pump seams to be a saginaw pump from a 60s-70s GM. You really have a choice to use any pump you like as ling as it has the right type of pulley and you can find the right fittings. There is a truck built by CPP that has a drop axle with the Toyota power steering box.

ford-y-block.com has an add-on pulley and power steering bracket.

Mid Fifties offers a horn kit. Otherwise you will loose your horn unless you put in a newer column. You could also put a horn button on the dash in one of the empty positions next to the other switches and *****.