318 Engine Build help

I've been reconsidering my cam choice. I'm thinking maybe the Lunati 60402
that someone recommended in another thread. 262/ 268, Lift .475/ .494 (220 int./226 exh. at .50) with 1.5 rocker ratio, so .507/.527 with the 1.6 rockers in the magnum heads. Lunati says to use their 73949 springs with it (1.440 dia. seat load 120 lbs @ 1.650, open load 165 @ 1.250, bind .950, spring rate 363 lb/in). I checked the recommendation for their cams that have the same valve lift with 1.5 rockers as this one does with 1.6 rockers, and they recommended the same. Question is, will they work with Magnum heads?
To this point, I think I have most of the details ironed out other than the push rods and springs. It seems like I heard somewhere that LS1 springs are a direct fit for Magnum heads. Any one know?