Trying to decide on 5-leaf or 6-leaf Springs

I hadn't thought about it but I believe you're right.

Somewhere along the line, probably 1981 when the previous owner painted my car, he put "Formula S" badging on it. I'll take them off when I paint it. But, I think 6-leaf were on the package.

Dana67Dart said

Not sure about 66 but in 67 (dart) the rallye suspension package came with 6 leaf rear springs

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