Not sure what your intentions are with your 440 Six Pack build but I was asking the same question when building a 440 Six Pack engine for my wife's R/T Challenger.
Mine was a fairly mild build with aluminum heads for a street driven car.
I didn't care if it had a radical sounding idle, I wanted a cam with good low and mid range power that would work good with a stock Six Pack setup.
I was also considering some MP and Comp cams grinds but after doing some research and getting some suggestions here I went with a Lunati Voodoo 60302 hydraulic camshaft
•Advertised Duration (Int/Exh): 262/268
•Duration @ .050 (Int/Exh): 220/226
•Gross Valve Lift (Int/Exh): .475/.494
•LSA/ICL: 112/108
•Valve Lash (Int/Exh): Hyd/Hyd
•RPM Range: 1400-5800
The engine has been run on the test stand and I hope to get it installed and up and running/driving real soon.
Good luck.