Great minds must think alike! I thought of sending you an e-mail last night and then the neighbor stopped over and it got too late. More on that later. It involves a couple of things for a forth comming tech article.
Anyhow I will give you a couple of quick answers to your questions and then answer them in more detail later this week. It is nice here too and I teach an adult class in the afternoon on  Tuesday. I want to get a couple of things done outside before the rain tomorrow evening.
Yes there was a kit. I installed one on a 770 industrial. On the power steering pump. The pump you are talking about was used from about 1961 untill theCessna pump was introduced. Later 770 tractors did have the hydrostatic steering from the factory but with the Cessna pump. Get your questions ready for this week end when I will have more time to answer. Is this tractor a gas or diesel?