[vettestr]

The after run is because it is idling at 1300 RPM. Until you cure that problem to shut down cleanly apply the brake firmly and let the clutch out as you turn off the key. Time it so you shut her off and then load the engine with the clutch to stop from dieseling.
As far as the reason why she is creeping up on idle only after an hour or so has me beat. I would look for a vac leak that was leaning her out and increasing RPM but after an hour is strange. Please post the fix when you or others find it.