Welcome to Club Cobra and the fun of owning a cool car. One thing you might check is to verify you have good grounds on your gauges. The first Cobra I built ran hot and several times I actually pulled off the road to let it cool off. One time I decided to open the hood and check things out when the gauge was reading really hot. I felt the radiator hoses and listened for any boiling noises and looked for any overflow, and nada. The hoses were hot but not what I expected them to be at the temp shown on the gauge.
That led me to think about the ground so I ran a temporary one direct from the gauge to a verified good ground and voila, no more over temp issues. Later I rewired the ground system for the dash to insure I had good grounds for all gauges.
Just something to check.
