Small block valve springs upgrade

I got through to comp cams today, what they told me is that the only way to get the five hundred lift at factory hight is to go double springs. All I have to do is take the valve guides down for different seals. And have all the retainers and keepers that fit. Another hundred and some dollars

That's BS... I have a set of crane single with damper running a 557 mechanical cam on J heads. Might be the same spring @perfacar mentioned.