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I have a 67 barracuda With a 318, 904, 4.10 gears... Running a 25" tall tire... At 60 mph I calculate my rpms to be 3300.... My tach is reading 4500-5000 cruising around 50-60mph... The tach reads 3500rpm when I am going 41mph... I know this is way off.... What could be the...