How are you going to store the car during the winter? If it's going to sit idle a lot, I would possibly consider checking & flushing the coolant yearly. But, if it will be in a heated garage, started and allowed to reach operating temp a few times over the winter - leave it alone.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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