Caltracks VS Super Stock Springs

Does anyone know where I can find out some information on Caltracks. I am building a 74 Dart Swinger for my wife to race. It will be track only and it will have a slightly more than stock 318 for now. I am trying to figure out what Caltracks exactly are and if I even need to have the added expense or if I can just go with super stock springs.

Thank you