springs and shocks

thanks to everybody for all the previous help on this forum ,it is great! I have just purchased some ss springs and am waiting for them to come in at the local dealer.can anyone tell me how much they will change my ride height over factory?aswell since I am changing the springs I was wondering about my shocks,i don't even remember what I put in when I put em in about 15 years ago, any reccomendations for a mostly street/ rare track occasion car. my ride is a 70 swinger. is it even worth changing the shocks or should I wait and see?