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.
Thank GOD we're not all you.