On my 70 Chevelle with LS6, I run around 210. I have a six blade deep pitch mechanical fan spaced out for 1/2" inside factory shroud. I have the rubber fender shields that cover the suspension removed to allow for more air movement. Besides getting air to come in through the rad, I also am concerned with removing 'heated air' from the engine compartment.
My rad is a four core brass, 20 # cap with a puke tank connected in closed circuit to take coolant back in the rad when it cools down. I run a 195 thermostat. I run a 50/50 mixture of distilled water/antifreeze with two bottles of Water Wetter in solution.
While in crawl traffic, I shift to neutral and add rpms to the engine to draw in more air and spin the water pump faster. My torque converter is a Street Fighter with 2800 stall, trans temp runs 245 - 250.
I try to keep my cruising time to the cooler part of the day.