I don't know what the ambient temperature was when you did your test but it sounds fine. A thermostat usually does not seal off the coolant completely so some rise in temp at the top of the radiator is to be expected.
I have a C750 Ford with a 391 in it. Unlike the F series truck, this engine has the thermostat mounted in an adapter a little in front of the intake manifold. I once replaced the thermostat with a brand that did not have a bleed hole in it. When the engine was first started every day the coolant temperature would rise until it started to boil and then the thermostat would open and everything would be fine until the engine was left to cool completely. Then the process would be repeated. Without the bleed hole the thermostat, there was no coolant flow around it and it would not get warm enough to open until the steam reached it.
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