clutch fan

First I want to thank everyone who responded . The radiator is #3574658 which is the radiator the car was born with . 318/A/C or 340 no A/C 2 row . After 5 minutes of running the temp goes up to 220 d. I have had the rad flow tested and it's fine . I have tried thermostats of 195d., 180d.,and 160d. I drained the coolant out yesterday and it was loaded with rust . The 383 is a mild performance motor with a clutch 18" fan . The factory shroud won't work because of the engine offset . I am just getting this car out after a long restoration . I have just 10 miles on it other than running in my driveway . I have NOT changed the radiator cap or the clutch fan . I would like to enjoy this car before I expire . Thanks again , Tom