I agree with that the cooler thermo wont help much. I have no idea why you think a non functional cowl induction hood or any other would have really anything to do with running hot on the highway. I have owned all the cars you have spoke of and then some and really the only time they ran hot was when something is wrong and there are lots of variables for determining whats up with that as well as alot of fixes too. If your car is running hot it could be a multitude of things, try some Wetter water to see if it helps any and go from there.
