None of my 71/4B gauges act like that. Just slowly come up to the lower side of the normal range.
Maybe your stat is sticking abit.
My 72 FSM calls for a 185* stat and thats what I've been running for 35 years in alot of Mopars.
Back in the day people would run a 195* in the winter and a 180* in the summer. Common here where it can be over 100* in the summer and -0* in the winter.
My 72 440 driver w/185* stat nevers gets over 190* in the summer but is a little cool in the winter.