Reading just under 210* on the temp gauge is very normal since the thermostat doesn’t open until 195*. But overheating when you stop is not normal and should be fixed asap.
That causes me to lean more at you having a fan clutch issue, but if it were me, I’d also install a mop at 195* and know u are good.
For good measure you can boil the thermostat to confirm it opens before you install it.
Additional note: If your system is corroded I’d look at replacing the hoses, radiator (mopar), and water pump (mopar). Drain and flush the system from the block to get the gunk out before you install the new radiator.