which springs for magnum 5.9 heads!!??

I have a magnum 5.9 im wanting to run my 230/.480 hyd flat tap cam in. I know about getting new push rods and oil through lifters and need to cut the guides down for retainer to seal clearance , but what valve springs do I need that will fit? There has been many build ups using these heads and this cam but they never freaking tell you which valve springs to use!! I know I can call comp cams with my dim.'s and they can figure out one that will work, but I done that before and they didn't seem like they knew there was a magnum head!! Im sure someone here has use these heads with a bigger than stock cam right? So help please!