Trying to cool my 1967 Camaro

[par69]

1967 Camaro with big block chevy motor. Motor is built nicely with Dart aluminum heads and solid roller cam, makes about 500hp to the wheels. Currently running a BeCool radiator with dual pass and 1 inch tubes. Also using a Lincoln mark 8 fan. The car also has Vintage AC set up. My problem is when running the car on the highway at speeds, the temperature gets up to over 210 degrees even with the high speed of the fan on. Driving around town, the temperature stays around 190 degrees. What do I need to do to cool this car. Do I need a radiator made with 1 1/4 inch tubes? The motor is tuned properly and the vacuum advance is not hooked up. I tried it with the vacuum advance hooked up but made no difference