almost overheating

I drive my 68 dart 270 over a mountain to get to work. It gets a little hot. The temp gage goes about 3/4 the way to max sometimes but never higher. The water pump and thermostat are new. The stock radiator and fan look pretty ancient so I ordered a new flexilite fan and a higher performance radiator but its backordered for at least 3 weeks. I want to know if it will be ok to drive for those 3 weeks or should I park it just in case.