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Old 05-11-2010, 02:20 PM
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Sounds like at higher speeds it is unable to get hot air out of the engine compartment fast enough. You could try a chin spoiler under the bottom of the radiator/core support like modern cars have(usually rubber), this creates a low pressure area behind the spoiler helping to draw the hot air that has come through the radiator out the bottom of the compartment.

Are you running a vacuum advance on the distributor?? Vacuum advance creates cooler running at cruise speeds.
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