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I would first start with some basic information.
Since this a wagon. Wagons came with taller tires and the speedo may have been calibrated differently at the factory for wagons compared to sedans. Many wagons have been fitted with smaller tires over the years (ie. the tire store did not know there was a difference between the wagon and sedan tire sizes) and that affects the speedo reading significantly.
What rear end ratio do you have?
Also, how is it that you know just how much your speedo is off?
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'60 PV544, '68 220, '70 145, '86 745T
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