Getting hot on the highway with the AC on.

89on35s said

My old 360 (R.I.P.) never got over 180 with all else being the same. Should I even worry about it?

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Typically heat at freeway speeds is an airflow problem.

But 20 deg rise on a 90 deg day with AC on might not be a problem.

In the Mojave desert there are stretches of road with a sign that reads "turn off AC next 10 miles" or the like. Sometimes the difference between good and overheated is the AC.

Tell us about your fan and/or shroud
Tell us about your old engine build