WAY WRONG CAM CHOICE!
That part number is for an AMC 6 cylinder engine. It's a flat tappet cam (you need a roller cam), and way too much cam for your setup. It calls for a 3000rpm stall torque converter, gears, 10:1 compression, and has a very rough idle. You'd need custom computer mods to run a cam with those specs, not to mention upgraded rod and crank bolts to make use of a 2500-6500rpm power range - think shifting at 7000rpm redline, and a bump in compression.
Something in this range is about as hot as you can run in a 5.9 Magnum without computer mods. Even with this one, you will still need the matching valve springs. The stock springs will rapidly weaken and fail with the increased lift, not to mention they are too weak to control the valves at higher rpm with that increased lift. Note that if you're looking to go with 1.7 rockers, this will bump up the cam specs and you will need computer mods then.