340 Cam Kits which ones work with a stock block

Lunati voodoo is about the only source of off the shelf cams optimized for the Mopar .904 lifter
(or Hughes) in your street duration sizes
many others (Howards, Engle, Bullit, crane) can do custom but comp has nothing smaller than their HL series
Many others like ISKY have nothing even custom

would you recap your heads, gears, body or weight and how do you drive it?
is your 340 68 vintage compression or late lower ??compression or has anyone ever changed pistons
what is your cranking compression?
The factory cam may be 209 @ .050 but it has very long ramps which bleeds off dynamic compression
anything done to your heads?
willing to cut your guides for more lift and viton seals?

OH! By the way, welcome aboard Wyrmrider!

By the way 68 Coronet RT, this, "cams optimized for the Mopar .904 lifter" is not allways needed to do. Certainly not for everyone or for an every day, daily driver. While the steeper ramps and quicker valve openings certainly do provide more power, it only shows up if your going to really taking advantage of it all. It's more Hype than anything on mild mills. The quicker cam ramps are tougher on the valve train. You should have no real worries though as long as the valve train geometry is dead on.