Anybody running the '68 4 speed 340 cam?

That is gunna be highly dependent on several things, such as 1) actual cylinder pressure and ring-seal
2) actual ignition-timing,
3) actual valve lash
4 internal engine friction
5) the running temperature
6) local conditions, including elevation.
7) the rear gear, car weight, aero, chassis drag.

To me, the numbers you asked for are irrelevant. but I would expect them to be quite low, somewhere around 10, maybe a bit less @700idle, and 18@2400, if she's getting the timing she wants which could be around 50 or more degrees.
Mine likes a minimum 56*
276/286/110@008 advertised, and 230/237@050.