Running hot, need bigger fan and other tricks advice please

[Morris]

Is the front body opening to the radiator sealed up so that air can’t get around the radiator???
The amount of air coming in the front of a Cobra body is way to much per our Magnehelic & Pitot tube readings and as the air comes in the front hole....it slows down in the area in front of the radiator so the air goes thru the radiator and cools the engine coolant....so to slow the water down with Water Wetter , we take a standard thermostat and remove the internal parts so its about a 1” hole and reinstall in the manifold.
A large motor with a long stroke will generate more heat and that is exactly what you have...the fans on the outside of the radiator don’t do much but block the air coming into the radiator shrouded area. The rear fan can help by pulling the air in when in a stopped position in traffic.
Then we lock the distributor vacuum advance out and set the full advance of 36* degrees in the motor....then we install a MSD Retarder on the ignition so that below 800 rpm the Retarder will back the timing off 25* degrees. Above 800 rpm’s the timing goes back up to 36* degrees, that way the engine is easy to start but once started it goes to full 36* degrees.
BTW we install the Spal 195* degree sending switch in the bottom radiator hose to kick the fan on when ever the return water gets to hot. All the fan relay needs is a ground to activate the relay to turn the fan on ...either thru the switch on the dash or the sender unit in the lower radiator hose.
Big motors make a lot of heat all of the time....natural characteristics and we’ve done a lot of testing this summer with air pressure in front of the radiator...behind the oil cooler and behind the radiator....but the front of the radiator has to be sealed up so no air gets by the radiator....