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My ERA uses the same Jag rear and ERA specs the rear springs at 10" 250 lbs/in. As far as the clearance goes, you will need to decide how much wheel travel is going to cause a tire to rub in the wheelwell. As you will need 1000 lbs of downforce to compress the 4 springs 1 inch, you won't be seeing much deflection in the rear unless you hit a really big pothole in street driving. Also consider the shock, is it going to bottom out before the spring does? If so, broken shocks will result.
John
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