I have a 1977 450 SEL with a low mileage transmission....The engine had a bad cam from lack of oil...I removed the crank and pistons from the block and their was no build up in the cylinders. This helps substanciate the Instrument cluster. The IC shows 85K.
If you are interested please send a email with your inquires...I am asking 300 dollars plus shipping....my email address is h16671836@yahoo.com thank you Jim

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James A. Harris