A Clark 207VO would be correct for a HC470 in 1950. If it were a 1954, it would have been born with a 302. An HC473 would be a 1950 model with 161" wb. Finding components other than what is listed on the line set in the glove box is also a good indication that it was once a tractor and was driven a lot of miles. Replacing a component with something that would fit was very common in those days.
