You can buy the 340 "resto" cam from Chrysler Part # P4452782 It has the original factory specs.
Another option would be the Lunati Voodoo Cam Part # 10200700
The cam I have is not lumpy at all, and is fantastic around town. I have the Lunati Voodoo hydraulic flat tappet 10200701 in my 318 and I love it. Much better than the stock cam. I am running it with my stock converter and 2.73 7 1/4 rear end (soon to be upgraded to something between 3.55 and 4.10, since my commute is only 5 miles and the track is only 20 miles away).