Original thermostat according to parts book was 170 degrees.
On my 4 Star (same engine) I used one for an 8N Ford. It is 160 degree but better than none. I have a note that gives Stant 13518/ CarQuest 31177/ Gates 33108/ NAPA 184 which are 180 degree. I have not checked any of these.
Thermostat goes in top radiator hose. Outlet end may be larger. I used CarQuest/gates hose 20791. As I recall it was a tight fit but has been on and working for 5 years. I also put a hose clamp around the hose to prevent thermostat from being forced forward into radiator.