Street Stock class circle track cars are based primarily on GM A body cars, they use custom springs all the time. the only problem might be that you can't find springs soft enough.
http://www.racecareng.com/Catalogs
another option, if you don't mind cutting the car up, is installing spring buckets. then you can wedge the car to any ride height you want.
if you don't want to go either of those routes, i'd just go down to NAPA and ask them to look up springs in a parts book. they should have a cross reference for springs by dimension and rate.
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