Dont mean to jump in on your post. But I have a similar problem. I have 1980 Trans Am, with a 400 out of a 74. I am running 3.42 gears and a TH400. My problem is in town it runs about 170-180 with no thermostat. Once i cruise on the freeway above 2500 rpm, it starts to creep to about 200. Everything is new. Radiator, OE fan shroud, water pump, and a HD fan clutch. I was thinking without the thermostat, the water is probably rotating too fast and is not cooling in the radiator. Carb is a 750 Holley. The plugs do come out a bit light after a hard run also, so could be leaning out..any suggestions???
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