Hughes carries an OK product but they an be difficult to deal with .
Lunati VooDoo series offers better grinds IMO Fast ramp speeds & high lift works great , duration seriously controls the lope & RPM powerband lift is free so more is better just like a roller cam , 701 or 702 grind will work well with decent power up grade but decent idle , vacuum & drivablilty .
so by keeping similar duration with a 114* CL & increasing lift to close to .500 it will work very well .
All lunati cams can be custom ground as well so you can get the same lobe spec but with a higher CL / increased lobe seperation so you can go up to 114 or 115* CL using agressive lobes so this will keep the powerband low with good idle .
I would recommend using a 3 bolt cam & a billet roller timing chain such as the JP performance one with multiple keyways to correct the installed CL like this one
http://www.ebay.com/itm/JP-Performance-JP5606T-Billet-Double-Roller-Timing-Chain-Mopar-361-440-3-Bolt-/221716641498 The factory Magnum cam was
Duration: 268/284 Degrees
Duration @0.050 228/241 degrees
Overlap: 46 Degrees
Center line: 115 Degrees
Lift:
Intake: 0.450"
Exhaust: 0.458"