1974 Ford F100 temp gauge

Trying to get all the little quirks worked out, but just had the 302 replaced with another after a timing chain break. New engine runs great. I do notice that driving down the road with the heater on, that the temp gauge goes a little above halfway. With it off, the gauge is just fine. Should I be worried? It’s def not over heating but I know there are some people out there who go “oh it’s over half way? Yeah it’s def overheating.” Its only with the heater blowing and the heater blows nice and hit everything runs solid. Opinions, answers anything welcome.