Don't understand cams

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

Yup, if you want stock performance you can't beat this solution.

Last cam I ran in my 340 with factory rockers was an isky 240/.480/108. I didn't car for it much. I actually liked the factory cam better.