Young,
Depends on the year. I had to swap the valve body on top of the gearbox to get the proper fitting to match the hose I put on my 1965 Dart. The H.P. fitting probably screws into a threaded port on the valve body, as your question suggests. I forget. If so, I am sure it isn't a pipe thread, but a straight thread, w/ either a copper flat washer or a corner O-ring seal. That could vary w/ year.
In my case, the hose changed because I changed from the factory TRW pump to the similar-looking Federal (or "Chrysler") pump. The pump changed because no brackets for the TRW pump to fit the later aluminum water pump. The w.p. changed to match the ~1972 radiator, which was all I could order from Autozone at the time. Your house-of-cards may vary.
The hose for the Federal pump has O-ring fittings at both ends, as I recall. The earlier TRW pump uses inverted flare fittings. The Saginaw pump (1970's) has another hose, if I recall. The hose sizes also vary, at least true for the return hose. They don't make it easy.