Is any moisture at all in the exhaust manifold acceptable, or should it be completly dry at all times? I am getting just a little bit at the very back of the manifold after I turned the idle up. Just the last exhaust port on each side of the the motor.

You will get a little bit with wet exhaust, particularly if looking at it after shutdown. You just don't want it to be wet all the way up and over the hump going back to the engine.