I'm building a '71 340 'cuda that will mainly be stock except I want to upgrade the cam a bit. The engine will have KB 9.5:1 pistons, stock J heads, iron intake w/ TQ carb, and stock exhaust. 4 speed with 3.91 axle from the factory. I want a fairly smooth idle and good vacuum so nothing too extreme. The cams I'm considering are:

1. Mopar Purpleshaft P4452761AE 268-272 Duration .450"/.455" Lift
2. Comp Cam Xtreme XE256H 256-258 Duration .447"/.455" Lift
3. Comp Cam Xtreme XE262H 262-270 Duration .462"/.470" Lift
4. Lunati Voodoo 60401LK 256-262 Duration 454"/.475" Lift

Anyone have experience with any of these cams, and if so would you recommend for what I'm building? Any other cam recommedations?

Thanks