[66Submarine]

I'll toss in that the "old school" cam designs are probably a good choice for a DD IMHO. The "new" cams use much more aggressive profiles and heavy valve springs to make more power, but that also means more stress/wear on the cam and valvetrain. Some are worse than others in this regard; you might do a google search for whatever cam you are planning on running to see if other people are having issues with them.