Howdy, The 400 in my car has pitting in the cylinders, so I'm putting the top end together for my 383 magnum. I need new valve springs to go with what I'm told is an old crane 'cheater' cam. Something like .500 lift. It's going to be for street/strip use. There is such a wide variety of spring rates and widths it's overwhelming. Any help is appreciated. Thanks.