340 Running Temp

When cruising my 69 Cuda, the temp will be 200 in the city and will rise to 205 while moving and upwards of 210-212 when cruising at 2800 RPM on the freeway with 3.23 gears. The cap was bad, as it was pushing water. That solved that issue, but the temp is the same. I would have to guess the pump is ok, as the belts are tight and water seems to be circulating. I replaced the thermostat a year ago and with the cap off, I can see slight movement of the coolant, signifying that the stat is working. Its a 185 unit. The radiator seems to be ok.

Are these temps too high? Would going to a 175 stat help?