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Ralphy, Again, I defer to Dana at Shell Valley. However, that being said, many years ago before the tubular control arms, I was told by Shell Valley and North American Fiberglass to use Mustang II V-6 front springs and cut at least one coil off for a big block Cobra. Now on my NAF car with a 351 C, I have Aldan's with 9 inch 400 pound springs and I am going to remove a coil as it is still too high. The ride is not all too harsh just too high.
I swear that your post stated that the shocks HPCOBRA had wer for lowered cars. Regardless, they should be fine as should yours.
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Searching your QA model number. Those are for lowered chassis, is that what you wanted?
The spring rate is, 1350-1525 lb. you may want to try 1150-1350 lb. springs.
Byron
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