1976 Dart Overheating and other issues

Hello,
This is my second post on the forum. I just purchased a nice 1976 dart with the 225 slant six. I'm located in Miami and it's always hot here. I can drive 20 miles before the temperature gauge goes to the 2 o'clock position just prior to the max approaching 250. I spoke to the previous owner who rarely drove the car and simply sold it as he is approaching his mid 70's in age. He took great car of it (original Florida car with no rust), however strongly recommended to have all fluids gone over. I changed the oil to what he was using Castrol 10w30 high mileage).

What can I do to get the car running cool so I can drive it? Amongst my research on here would be:
1. Flush the radiator
2. Replace the thermostat with a 180 (minimum)
3. Replace the radiator cap (I currently have a 13# pressure)
4. Ill probably change out all the hoses (although they look ok- they're soft)
5. Change plugs for good measure
6. Check the timing (I've read 6 degrees is good)