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I assume you got a coilover kit. If the springs are the 2.5" ID Eibach units, then hopefully they are more than 8" springs. 300 lb springs are fine for street and such (I believe Eibach Pro-kits are in the range of 250-270 lbs but they are progressive) as long as they are long enough such that you have adequate spring travel. I usually suggest a 425-450 lb spring for 8" units and probably a 10" spring if you want to run springs as light as 300 lbs. Lot depends on how you design your coilover kit as what spring length will fit though. I cut my strut housings about 2" shorter, so I can't fit 10" springs at the current car height.