Correct, the motion ratio of the factory GM short/long arm suspension is just about 2:1. It's not quite, but near as makes no difference. 1" of motion at the spring is equal to 2" of motion at the wheel.
And yes, even the china copies typically have the lowered spring pocket. The ones we used on my wife's chevelle did.
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-Jason
1969 Pontiac Firebird
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