Yes, those are the specs right out of the 68 Plymouth service manual...
@dibbons contacted me about the 68 340 4 speed cam. I had a custom ground cam that I bought here from another member. We sent it to Oregon Cam Grinders and Ken Heard made a master of it. It is so close to the stock 340 4 speed cam - just .006" less intake lift, but the center lines, duration, and exhaust lift are right on the stock spec. That is as close as we can come right now to a stock 68 340 4 speed cam...
If anyone wants to try it, call Ken Heard at Oregon Cam Grinders....