Super Stock Springs??

hey guys. i still need to order the springs for my scamp. i have ordered all my front end parts but im not sure what i should do for leaf springs. any suggestions on stiffer springs. do the ss springs make your car sit crooked? and do these have a larger 5/8 eye bolt. ive seen the heavy duty spring hangers that say they have the larger 5/8 eye bolt for ss springs. thanks for the help.