Obviously you will want to keep away from post 1981 machines that were built by CCC rather than IH. The CCC tractors are plenty fine, but you want a proper companion for your Scout.
The next basic dividing line is the narrow vs wide frame models. In some areas of the country you will have better or worse luck in finding implements for the two styles of machines, which are not interchangeable. In the narrow frames, you could look for 127s or 147's made about 1971. In the wide frames, look for 129s or 149s.
Lots of other choices, this is just a basic set of ideas for you.
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