When I bought my '89 GT a few years ago it had about 85,000 miles. It ran hot and was loosing coolant but it wasn't too bad. As a precaution I installed the Ford Motorsport aluminum radiator and while I had the radiator out, I replaced my water pump that had started to leak out of the bottom weep hole. It made a huge difference and I've had about 35,000 trouble free miles. The older a motor is, the more heat can become a problem. I think with performance mods as the number one priority, we tend to forget the simple things like keeping things cool. Good luck and I hope my two cents help.
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